【英语】which代表什么？

Question

The dramatic development of communication networks contributed to the alarming rate at which the number of smartphone users in China has been increasing ,changing the way in which many people read.

这两个which表什么成分的？都是定语从句么？

Answer 1

which 有一些几种用法：
〔疑问形容词〕充当定语，修饰名词；
〔疑问代词〕充当主语、宾语或表语。
〔关系代词〕用在定语从句中，指代表示物的先行名词。

本句的结构如下：
〔主句〕The dramatic development of communication networks contributed to the alarming rate (通信网络的迅猛发展导致了令人担忧的发展)
〔定语从句〕at which the number of smartphone users in China has been increasing, changing the way in which many people read (中国智能手机用户的数量在通讯网络上不断增加，改变了许多人的阅读方式) 【which 指代先行词 the communication networks】追问

请问后面那个which该怎么解释呢。。

追答

翻译中已经点名了，等于 at the communication networks。

Answer 2

at which引导定语从句，修饰the rate（which代表rate）
in which引导定语从句，修饰the way （which 代表way）追问

谢谢！

Answer 3

A good article will cover the who, the what, the when, the where, the why and the how.

Answer 4

哪一种，那一些

Answer 5

女包、配饰