Question

分析下这个英语句子的结构！再翻译一下！谢了

An index is a system by which changes in the value of something and the rate at which it changes can be recorded, measured, or interpreted.
看晕了。。

Answer 1

句子的结构：An index is a system 是主句，后面有两个定语从句修饰，其一是by which changes can be recorded, measured, or interpreted这个定语从句修饰先行词a system; 其二是at which it changes 这个定语从句修饰先行词the rate.
翻译：索引（指数）是一个某种东西的价值和它的速度变化可以记录，测量，或解释的系统。
希望对你有帮助！

Answer 2

An index is a system(主句), by which（定语从句） changes ((in the value of something)) and the rate ((at which it changes，修饰the rate的从句)) （changes, the rate是 从句的主语) can be recorded, measured, or interpreted（可以被记录，测量，解释，从句的谓语）.

追问

An index is a system （by which changes in the value of something and the rate （at which it changes） can be recorded, measured, or interpreted.）。
如果把修饰现行词的从句都加上括号，是这样吗？
changes 和 the rate 作为can be recorded...的并列主语？
索引是用来记录、测量或解释事物的价值及其变化速率的系统！

追答

1.是的，你加的外层括号是system的定语从句，内层括号是rate的定语从句。
2.是的，changes和the rate是can be recoreded....的主语。
3.翻译我不了解语境，changes in the value of something......,可以翻译成“物值变化及其变化速率”，其它的你可以再琢磨琢磨。另，你把语句翻译变成主动式挺顺畅的。

Answer 3

An index is a system by which changes in the value of something and the rate at which it changes can be recorded, measured, or interpreted.

1 An index is a system
2 changes in the value of something can be recorded, measured, or interpreted by the system
3 and the rate at which it changes can be recorded, measured, or interpreted by the system.

4 An index is a system by which changes and the rate can be recorded, measured, or interpreted by the system.