Looking at Secondary Data – Chlorinating Water | 解读二手数据——水的氯化消毒

📚 Looking at Secondary Data – Chlorinating Water | 解读二手数据——水的氯化消毒

In science, you will often meet data that you did not collect yourself. For example, water companies publish measurements of chlorine levels in drinking water. When you use this kind of information, you are working with secondary data. The skill is not just reading the numbers but also judging how reliable and useful they are.

在科学中，你会经常遇到并非自己收集的数据。例如，自来水公司会公布饮用水中氯含量的测量结果。使用这类信息时，你就是在处理二手数据。这项技能不只是读取数字，还要判断这些数据有多可靠、多有用。

1. What is Secondary Data? | 什么是二手数据？

Secondary data is data collected by someone else. It can come from reports, websites, textbooks, newspapers or databases. Primary data, in contrast, is collected by you through your own experiment or observation.

二手数据是由其他人收集的数据。它可以来自报告、网站、教科书、报纸或数据库。相反，一手数据是你通过自己的实验或观察收集的。

In a school laboratory, you might test a water sample with a chlorine test strip. That is primary data. If you then look at a water company’s table of chlorine readings from many treatment works, that is secondary data.

在学校实验室里，你可能会用氯测试条检测水样，那是一手数据。如果你随后查看

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