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英语从句问题The point is that users should be in control of their

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英语从句问题
The point is that users should be in control of their data,which means they need an easy way of accessing it.
which means 引导的什么从句?which means前一定要加逗号吗?
英语从句问题The point is that users should be in control of their
which在这里引导的是非限定性定语从句,which可代整个主句,相当于and this或and that.类似的还有as,只不过用as引导时,as一般放在句首,which一般放在句中.
比如:As we know,smoking is harmful to one's health.
The sun heats the earth,which is very important to us.
which引导的非限定性定语从句是用来说明前面整个句子的情况或主句的某一部分,而非限定性定语从句:主句与从句需要用逗号隔开.所以which前要加逗号.