📚 Year 7 Cambridge Further Mathematics: Vocabulary & Terminology Quick-Memorisation Guide | Year 7 Cambridge 进阶数学：词汇术语速记指南
Mastering the language of mathematics is the first and most critical step towards excelling in Year 7 Cambridge Further Mathematics. Without a firm grasp of the core vocabulary, even the simplest problem can become a puzzle of incomprehensible instructions. This guide breaks down over sixty essential mathematical terms into logical categories, pairing each with a clear definition, a memory tip, and a bilingual explanation designed to help you think fluently in both English and mathematical reasoning. By the end of this guide, you will not only recognise these words on sight but also understand exactly how to use them in an exam setting.
精通数学语言，是迈向 Year 7 Cambridge 进阶数学高分的第一步，也是最关键的一步。如果对核心词汇没有牢固的掌握，即使是最简单的问题，也可能变成一堆难以理解的指令谜题。本指南将六十多个核心数学术语按逻辑类别拆解，每个术语都配有清晰的定义、记忆窍门以及双语解释，旨在帮助你用英语和数学推理顺畅地思考。读完本指南，你不仅能在看到这些词时立即认出它们，还能确切地知道如何在考试中运用它们。
1. Number Types and Place Value | 数字类型与位值
An integer is any whole number that can be positive, negative, or zero — but never a fraction or decimal. Think of the word ‘integer’ as sharing its root with ‘integrity’, meaning something whole and unbroken. Integers are the building blocks of almost every topic you will encounter in Year 7, from negative number operations to algebraic substitution.
整数 (integer) 是指任何可以是正数、负数或零的完整数字——但绝对不能是分数或小数。可以记住 ‘integer’ 与 ‘integrity’（完整）共享词根，意味着完整、未被打破的东西。整数是你将在 Year 7 遇到的几乎所有主题的基石，从负数运算到代数代入。
A place value chart assigns every digit a value based on its position. For example, in 3472.56, the digit 3 holds the thousands place (value 3000), while the digit 5 sits in the tenths column (value 0.5). Memorising the columns — millions, hundred-thousands, ten-thousands, thousands, hundreds, tens, units, tenths, hundredths, thousandths — turns long numbers from intimidating strings into readable quantities.
位值 (place value) 表根据数字的位置赋予每一位数字相应的值。例如，在 3472.56 中，数字 3 占据千位（值为 3000），而数字 5 位于十分位（值为 0.5）。熟记这些数位——百万位、十万位、万位、千位、百位、十位、个位、十分位、百分位、千分位——能把长串数字从令人畏惧的字符串转变为可读的数量。
A square number results from multiplying an integer by itself: 1² = 1, 2² = 4, 3² = 9, 4² = 16, 5² = 25, and so on. The term comes from the geometric idea that a square with side length n has an area of n². Similarly, a cube number comes from multiplying an integer by itself twice: 1³ = 1, 2³ = 8, 3³ = 27, reflecting the volume of a cube.
平方数 (square number) 是将一个整数与其自身相乘的结果：1² = 1、2² = 4、3² = 9、4² = 16、5² = 25，依此类推。这个术语源自几何概念：边长为 n 的正方形，其面积为 n²。类似地，立方数 (cube number) 来自将一个整数与其自身相乘两次：1³ = 1、2³ = 8、3³ = 27，反映了立方体的体积。
Knowing your prime numbers — integers greater than 1 that have exactly two factors, 1 and themselves — saves massive amounts of time in factorisation and fraction work. The primes under 30 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29. Note that 2 is the only even prime, which makes it a favourite exam trick.
熟记质数 (prime numbers)——大于 1 且恰好只有两个因数（1 和它本身）的整数——能在因式分解和分数运算中节省大量时间。30 以内的质数有 2、3、5、7、11、13、17、19、23、29。注意 2 是唯一的偶质数，这使它成为考试中常见的陷阱题。
2. Fractions, Decimals and Percentages | 分数、小数与百分比
The numerator sits above the fraction bar and tells you how many equal parts you have. The denominator sits below and tells you how many equal parts make one whole. A quick memory trick: think ‘denominator = down’ — both words start with ‘d’. Never swap these two, because 2/5 and 5/2 mean completely different quantities (two-fifths versus two and a half).
分子 (numerator) 位于分数线之上，告诉你拥有多少个相等的部分。分母 (denominator) 位于分数线之下，告诉你多少个相等的部分组成一个整体。一个快速记忆诀窍：记住 ‘denominator = down’——两个词都以 ‘d’ 开头。永远不要将这两个位置互换，因为 2/5 和 5/2 表示完全不同的数量（五分之二与二又二分之一）。
An improper fraction has a numerator larger than or equal to its denominator, such as 7/4 or 11/3. This does not mean the fraction is ‘wrong’; it simply means the value is greater than or equal to 1. A mixed number combines a whole number with a proper fraction, like 1¾. Converting between the two forms is a core skill tested repeatedly from Year 7 through to IGCSE.
假分数 (improper fraction) 的分子大于或等于其分母，例如 7/4 或 11/3。这并不意味着这个分数是“错误的”；它只是意味着其值大于或等于 1。带分数 (mixed number) 将一个整数与一个真分数组合在一起，比如 1¾。在这两种形式之间进行转换是一项从 Year 7 一直到 IGCSE 都会反复考查的核心技能。
A decimal uses a decimal point to separate whole units from fractional tenths, hundredths, and thousandths. The word ‘decimal’ comes from the Latin decimus, meaning tenth. When you see ‘terminating decimal’ (e.g. 0.75 — it ends) and ‘recurring decimal’ (e.g. 0.333… — it repeats forever), you can distinguish them by asking: does the division ever finish?
小数 (decimal) 使用小数点将整数单位与十分位、百分位、千分位的小数部分分开。’decimal’ 一词源自拉丁语 decimus，意为十分之一。当你看到“有限小数 (terminating decimal)”（例如 0.75——它会终止）和“循环小数 (recurring decimal)”（例如 0.333…——它永远重复）时，你可以通过一个问题来区分它们：这个除法运算会结束吗？
A percentage means ‘per hundred’ and is always a fraction with denominator 100. Memorise these key equivalences: 50% = 1/2 = 0.5, 25% = 1/4 = 0.25, 75% = 3/4 = 0.75, 10% = 1/10 = 0.1, 20% = 1/5 = 0.2. Knowing these instantly makes percentage increase, decrease, and reverse percentage problems far more manageable.
百分比 (percentage) 意为“每一百”，始终是一个分母为 100 的分数。熟记以下关键等式：50% = 1/2 = 0.5、25% = 1/4 = 0.25、75% = 3/4 = 0.75、10% = 1/10 = 0.1、20% = 1/5 = 0.2。立即反应出这些等式，能让百分比增加、减少以及逆向百分比问题变得容易得多。
3. Ratio and Proportion | 比与比例
A ratio compares the sizes of two or more quantities of the same unit. The ratio 3:5 reads as ‘three to five’ and means for every 3 parts of the first quantity, there are 5 parts of the second. Ratios do not tell you the actual amounts — only the relative sizes. Common exam pitfall: students confuse ratio with fraction. A ratio of 3:5 means the first quantity is 3/(3+5) = 3/8 of the total, not 3/5.
比 (ratio) 用于比较两个或两个以上相同单位的量的大小。比 3:5 读作“三比五”，意味着每 3 份第一个量，就有 5 份第二个量。比并不告诉你实际的数量——只告诉你相对大小。常见考试陷阱：学生常将比与分数混淆。3:5 的比意味着第一个量占总量的 3/(3+5) = 3/8，而不是 3/5。
Proportion goes one step further than ratio by describing a part in relation to the whole. If 3 out of 10 students wear glasses, the proportion wearing glasses is 3/10 or 30%. The phrase ‘in proportion’ means two ratios are equal, forming a proportion equation such as a/b = c/d, which you solve by cross-multiplication.
比例 (proportion) 比“比”更进一步，它描述部分与整体的关系。如果 10 个学生中有 3 个戴眼镜，那么戴眼镜的比例就是 3/10 或 30%。短语“成比例 (in proportion)”意味着两个比相等，形成了一个比例方程，例如 a/b = c/d，可以通过交叉相乘来求解。
Direct proportion means as one quantity doubles, the other also doubles; their ratio stays constant. The graph of a directly proportional relationship is always a straight line passing through the origin (0,0). In contrast, inverse proportion means as one quantity doubles, the other halves; their product stays constant.
正比例 (direct proportion) 意味着当一个量翻倍时，另一个量也翻倍；它们的比值保持不变。正比例关系的图像始终是一条通过原点 (0,0) 的直线。相比之下，反比例 (inverse proportion) 意味着当一个量翻倍时，另一个量减半；它们的乘积保持不变。
4. Algebraic Expressions and Terminology | 代数表达式与术语
A variable is a letter or symbol that stands for an unknown or changeable number. In Year 7, you will most commonly see x, y, n, and a. Think of a variable as an empty box waiting to be filled with a number. The term comes from ‘vary’, meaning to change — which is exactly what the value of a variable does depending on the context.
变量 (variable) 是代表未知或可变数字的字母或符号。在 Year 7 中，你最常见到的变量是 x、y、n 和 a。可以把变量想象成一个等待填入数字的空盒子。这个术语源自 ‘vary’（变化），意味着改变——这正是变量的值根据上下文所做的事情。
A coefficient is the number placed directly in front of a variable, indicating multiplication. In 5x, 5 is the coefficient. If a variable appears alone (e.g. x), its coefficient is an invisible 1, not zero — a common mistake. Understanding coefficients is essential for simplifying expressions and later for solving equations.
系数 (coefficient) 是直接放在变量前面的数字，表示乘法。在 5x 中，5 就是系数。如果一个变量单独出现（例如 x），它的系数是隐形的 1，而不是 0——这是一个常见错误。理解系数对于化简表达式以及后续解方程至关重要。
A term is a single mathematical entity — a number, a variable, or numbers and variables multiplied together — separated by + or − signs. In the expression 3x² + 7y − 5, there are three terms: 3x², 7y, and −5. Like terms have exactly the same variable raised to exactly the same power; only like terms can be combined through addition or subtraction.
项 (term) 是一个单一的数学实体——一个数、一个变量，或者数与变量相乘的结果——由 + 或 − 号分隔。在表达式 3x² + 7y − 5 中，有三项：3x²、7y 和 −5。同类项 (like terms) 具有完全相同的变量且该变量具有完全相同的指数；只有同类项才能通过加法或减法进行合并。
An expression is a combination of terms without an equals sign — it is a phrase, not a full sentence. 4a + 2b − 7 is an expression. An equation is a statement that two expressions are equal, identified by the = sign. 4a + 2b − 7 = 15 is an equation. Remember: expressions are simplified; equations are solved. Never say ‘solve the expression’ — examiners will mark this as a conceptual error.
表达式 (expression) 是各项的组合，不包含等号——它是一个短语，而不是一个完整的句子。4a + 2b − 7 是一个表达式。方程 (equation) 是声明两个表达式相等的陈述，通过 = 号来识别。4a + 2b − 7 = 15 是一个方程。记住：表达式是用来化简的；方程是用来求解的。绝不要说“求解表达式”——考官会将其标记为概念性错误。
5. Equations and Inequalities | 方程与不等式
Solving an equation means finding the value of the variable that makes the statement true. The golden rule is balance: whatever operation you perform on one side, you must perform identically on the other. Visualise a balanced scale; adding weight to one side requires adding the same weight to the other to maintain equilibrium.
解方程意味着找到使该陈述成立的变量值。黄金法则是平衡：你对等式的一边进行任何运算，都必须对另一边进行完全相同的运算。想象一个平衡的天平；在一侧增加重量，就需要在另一侧增加相同的重量才能保持平衡。
An inequality uses symbols < (less than), > (greater than), ≤ (less than or equal to), or ≥ (greater than or equal to) instead of an equals sign. The open side of the < or > symbol always faces the larger number — think of it as a hungry crocodile that wants to eat the bigger meal. 5 > 3 reads ‘5 is greater than 3’.
不等式 (inequality) 使用符号 <（小于）、>（大于）、≤（小于或等于）或 ≥（大于或等于）来代替等号。< 或 > 符号的开口端始终朝向较大的数字——可以把它想象成一条饥饿的鳄鱼，它想吞下更大的食物。5 > 3 读作“5 大于 3”。
When multiplying or dividing both sides of an inequality by a negative number, you must reverse the inequality sign. For example, −2x > 6 becomes x < −3. This is one of the most frequently forgotten rules in Year 7 tests; write it on a sticky note until it becomes instinctive.
当对不等式两边同时乘以或除以一个负数时，必须反转不等号的方向。例如，−2x > 6 变为 x < −3。这是 Year 7 考试中最常被遗忘的规则之一；把它写在便利贴上，直到它成为本能反应。
6. Geometry — Angles and Lines | 几何——角与线
An angle measures the amount of turn between two lines that meet at a vertex. Angles are measured in degrees (°). The core angle types form a clear hierarchy: an acute angle measures between 0° and 90°; a right angle is exactly 90° (marked with a small square in diagrams); an obtuse angle ranges between 90° and 180°; and a reflex angle measures between 180° and 360°. The prefix ‘obtuse’ shares a root with ‘obstruct’, hinting at something broad and blunt.
角 (angle) 度量从一个顶点出发的两条线之间的旋转量。角以度（°）为单位。核心角度类型构成一个清晰的层级：锐角 (acute angle) 的度数在 0° 到 90° 之间；直角 (right angle) 恰好为 90°（在图中用一个小正方形标记）；钝角 (obtuse angle) 的范围在 90° 到 180° 之间；而优角 (reflex angle) 的度数在 180° 到 360° 之间。前缀 ‘obtuse’ 与 ‘obstruct’（阻碍）共享词根，暗示着某种宽大而钝的东西。
Parallel lines are straight lines that never meet, no matter how far they extend in either direction — they always remain exactly the same distance apart. The word ‘parallel’ can be remembered through the two identical ‘l’s running side by side. Perpendicular lines intersect at exactly 90°; the term contains the word ‘pend’, related to ‘pendulum’, suggesting something hanging straight down at a right angle to the horizontal.
平行线 (parallel lines) 是无论向两个方向延伸多远都永不相交的直线——它们始终保持完全相同的间距。’parallel’ 这个词可以通过两个并排的、完全相同的小写 ‘l’ 来记忆，它们像平行线一样并肩延伸。垂直线 (perpendicular lines) 以恰好 90° 相交；这个术语中包含 ‘pend’，与 ‘pendulum’（钟摆）相关，暗示某物垂直于水平面笔直下垂。
7. Polygons and Their Properties | 多边形及其性质
A polygon is a closed, flat (2D) shape made entirely of straight sides. The word comes from Greek: poly (many) + gon (angle). Name polygons by counting their sides: triangle (3), quadrilateral (4), pentagon (5), hexagon (6), heptagon (7), octagon (8), nonagon (9), decagon (10). ‘Quadrilateral’ literally means ‘four sides’ — ‘quad’ (four) + ‘lateral’ (side), the same root as ‘unilateral’ or ‘bilateral’.
多边形 (polygon) 是仅由直边构成的封闭平面（二维）形状。这个词源于希腊语：poly（多）+ gon（角）。通过数边数来命名多边形：三角形 (triangle, 3)、四边形 (quadrilateral, 4)、五边形 (pentagon, 5)、六边形 (hexagon, 6)、七边形 (heptagon, 7)、八边形 (octagon, 8)、九边形 (nonagon, 9)、十边形 (decagon, 10)。’Quadrilateral’ 字面意思是“四条边”——’quad’（四）+ ‘lateral’（边），与 ‘unilateral’（单边的）或 ‘bilateral’（双边的）词根相同。
A regular polygon has all sides equal and all interior angles equal — a square is a regular quadrilateral, but a rectangle is not. An irregular polygon breaks at least one of these conditions. The interior angle is the angle inside the polygon between two adjacent sides; the exterior angle is the angle between any side and the extension of the adjacent side. For any polygon, the exterior angles always sum to 360°.
正多边形 (regular polygon) 的所有边相等，所有内角相等——正方形是正四边形，但长方形不是。不规则多边形 (irregular polygon) 至少违反其中一项条件。内角 (interior angle) 是多边形内部两条相邻边之间的角；外角 (exterior angle) 是任意一边与其相邻边的延长线之间的角。对于任何多边形，外角的总和始终为 360°。
8. Perimeter, Area and Volume | 周长、面积与体积
Perimeter is the total distance around the outside edge of a 2D shape — imagine walking all the way around a park and measuring your path. The word breaks down to ‘peri’ (around) + ‘meter’ (measure), the same ‘peri’ as in ‘periscope’ (looking around). Always remember to state the unit (cm, m, km) with your answer, as a bare number loses meaning.
周长 (perimeter) 是二维形状外边界的总距离——想象绕着公园走一圈并度量你的路径。这个词可以拆解为 ‘peri’（周围）+ ‘meter’（度量），与 ‘periscope’（潜望镜，环顾四周）中的 ‘peri’ 相同。永远记住在答案中标明单位（cm、m、km），因为光秃秃的数字会失去意义。
Area measures the amount of surface a 2D shape covers, expressed in square units (cm², m², km²). For a rectangle, area = length × width. For a triangle, area = ½ × base × vertical height. Note the word ‘vertical’ — the height must be perpendicular to the base, not the slanting side. This is one of the most tested concepts in Year 7 geometry.
面积 (area) 度量二维形状所覆盖的表面大小，以平方单位（cm²、m²、km²）表示。对于长方形，面积 = 长 × 宽。对于三角形，面积 = ½ × 底 × 垂直高度。注意“垂直”一词——高必须垂直于底边，而不是斜边。这是 Year 7 几何中考查频率最高的概念之一。
Volume measures the amount of space a 3D object occupies, expressed in cubic units (cm³, m³). For a cuboid, volume = length × width × height. Distinguish carefully: perimeter is a length (1D), area covers a surface (2D), and volume fills a space (3D). Mixing these up is a classic avoidable error.
体积 (volume) 度量三维物体所占据的空间大小，以立方单位（cm³、m³）表示。对于长方体，体积 = 长 × 宽 × 高。要仔细区分：周长是长度（一维），面积覆盖表面（二维），而体积填充空间（三维）。将它们混淆是一个经典但可以避免的错误。
9. Statistics — Averages and Spread | 统计——平均数与离散程度
The mean (arithmetic average) is calculated by summing all values and dividing by the number of values. Students often find the word ‘mean’ unhelpfully vague, but linking it to ‘meaning’ can help — the mean gives you a meaningful central value. The median is the middle value when data is arranged in order; for an even count, take the mean of the two central values. Think ‘median’ as the ‘medium’ — it sits in the centre.
平均数 (mean, 算术平均值) 的计算方法是将所有数值相加，再除以数值的个数。学生常常觉得 ‘mean’ 这个词含糊不清，但将其与 ‘meaning’（意义）联系起来会有所帮助——平均数给你一个有意义的中心值。中位数 (median) 是将数据按顺序排列后居中的那一个值；如果数据个数为偶数，则取中间两个数的平均值。可以把 ‘median’ 想象成 ‘medium’（中间的）——它位于中心。
The mode is the most frequently occurring value in a data set. Remember ‘mode = most’ — the two words share the first two letters. The range measures how spread out the data is, calculated as the largest value minus the smallest value. Always subtract the minimum from the maximum, never the other way around, or you will get a negative number.
众数 (mode) 是数据集中出现频率最高的值。记住 ‘mode = most’（出现最多的）——这两个词共享前两个字母。极差 (range) 度量数据的分散程度，计算方法是最大值减去最小值。始终用最大值减去最小值，千万不能反过来，否则你会得到一个负数。
10. Coordinates and Graphs | 坐标与图像
The Cartesian coordinate system uses two perpendicular number lines — the x-axis (horizontal) and y-axis (vertical) — to locate points on a plane. A point is written as an ordered pair (x, y), where x comes first. Memorise the phrase ‘along the corridor, up the stairs’: you move along the x-axis first, then up the y-axis. The point where the axes meet is the origin, labelled (0, 0).
笛卡尔坐标系 (Cartesian coordinate system) 使用两条垂直的数轴——x 轴（水平）和 y 轴（垂直）——来定位平面上的点。一个点写作一个有序数对 (ordered pair) (x, y)，其中 x 在前。牢记口诀“沿着走廊走，再上楼”：你先沿着 x 轴移动，再沿着 y 轴向上移动。两条轴相交的点是原点 (origin)，标记为 (0, 0)。
The four quadrants divide the coordinate plane into four regions, numbered counterclockwise from the top right. Quadrant I: (+, +), Quadrant II: (−, +), Quadrant III: (−, −), Quadrant IV: (+, −). Understanding quadrants is essential for later work with transformations, vectors, and trigonometric functions.
四个象限 (quadrants) 将坐标平面划分为四个区域，从右上角开始按逆时针方向编号。第一象限：(+, +)；第二象限：(−, +)；第三象限：(−, −)；第四象限：(+, −)。理解象限对于后续的变换、向量和三角函数学习至关重要。
11. Transformations | 变换
A translation slides every point of a shape the same distance in the same direction. It is described by a column vector — a pair of numbers stacked vertically inside brackets that tell you how far to move horizontally (top number) and vertically (bottom number). A positive top number means move right; a negative one means left. A positive bottom number means move up; negative means down.
平移 (translation) 将形状上的每一个点沿同一方向滑动相同的距离。它通过一个列向量 (column vector) 来描述——括号内竖向堆叠的一对数字，告诉你水平移动（上方数字）和垂直移动（下方数字）的距离。上方数字为正意味着向右移动，为负则为向左。下方数字为正意味着向上移动，为负则为向下。
A reflection flips a shape over a mirror line, producing a mirror image where every point is the same perpendicular distance from the mirror line as its image. The mirror line is often described by an equation such as x = 0 (the y-axis), y = 0 (the x-axis), or y = x (the diagonal line through the origin).
反射 (reflection) 沿着一条镜像线 (mirror line) 翻转一个形状，产生一个镜像，镜像中的每个点到镜像线的垂直距离都与原像中对应点的距离相等。镜像线通常由一个方程来描述，例如 x = 0（y 轴）、y = 0（x 轴）或 y = x（通过原点的对角线）。
A rotation turns a shape about a fixed point called the centre of rotation, through a specified angle and direction (clockwise or anticlockwise). A quarter-turn anticlockwise is a rotation of 90°; a half-turn is 180°. The shape does not change size — rotation is an example of a congruent transformation, where the image is identical in size and shape to the original.
旋转 (rotation) 绕一个固定点（称为旋转中心 (centre of rotation)）旋转一个形状，旋转通过指定的角度和方向（顺时针或逆时针）来完成。逆时针旋转四分之一圈是 90° 旋转；半圈是 180°。形状的大小不会改变——旋转是全等变换 (congruent transformation) 的一个例子，在这种变换中，像与原像的大小和形状完全相同。
12. Measurement and Units | 度量与单位
The metric system is built on powers of ten, making conversions straightforward once you know the prefixes. Kilo- means one thousand (1000 m = 1 km). Centi- means one hundredth (100 cm = 1 m). Milli- means one thousandth (1000 mm = 1 m). Remember the descending order: km > m > cm > mm, and multiply or divide by powers of 10 accordingly when converting.
公制系统 (metric system) 建立在 10 的幂次之上，一旦你掌握了这些前缀，单位换算就会变得简单直接。Kilo- 表示一千（1000 m = 1 km）。Centi- 表示百分之一（100 cm = 1 m）。Milli- 表示千分之一（1000 mm = 1 m）。记住从大到小的顺序：km > m > cm > mm，在进行换算时相应地乘以或除以 10 的幂次。
Mass and weight are often used interchangeably in Year 7 mathematics, though in physics they are distinct concepts. Mass is measured in grams (g) and kilograms (kg); 1 kg = 1000 g. Capacity refers to how much liquid a container can hold, measured in litres (L) and millilitres (mL); 1 L = 1000 mL. A useful equivalence for problem-solving: 1 cm³ of water at standard temperature has a mass of exactly 1 g and occupies a volume of 1 mL.
在 Year 7 数学中，质量 (mass) 和重量 (weight) 通常互换使用，尽管在物理学中它们是不同的概念。质量以克 (g) 和千克 (kg) 为单位；1 kg = 1000 g。容量 (capacity) 指的是一个容器能容纳多少液体，以升 (L) 和毫升 (mL) 为单位；1 L = 1000 mL。一个对解题很有用的等价关系：在标准温度下，1 cm³ 的水质量恰好为 1 g，且占据的体积为 1 mL。
Understanding the relationship between 12-hour and 24-hour clock time is a practical skill frequently tested. To convert from 12-hour to 24-hour: for times after noon (PM), add 12 to the hour unless it is 12 PM itself. Thus 2:30 PM becomes 14:30, while 12:00 PM remains 12:00 and 12:00 AM becomes 00:00. Always use four digits in 24-hour format.
理解12 小时制与 24 小时制时间 之间的关系是一项经常被考查的实用技能。从 12 小时制转换为 24 小时制：对于
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