第二题，为什么要选as,这里并没有“正如”的意思呀?

第二题，为什么要选as,这里并没有“正如”的意思呀?

定语从句中，as引导非限定定语从句，as代指主句内容，用法和as we all know 里面用法一致。至于as译为“正如”并不是那么有必要。追问那which不也可以指代主句内容吗?追答不同点参考一下几点：
1. as可以放在主句前后，也可插入主句之中；而which引导的非限制性从句只能位于主句之后。

As is known to all, fish can’t live without water.

Air, as we know, is gas.

2.在非限制性从句中，which后的be动词不可省；as而后的be动词可以省略。

She told me she won the match, which was a lie.

The material is elastic, as (was) shown in the figure.

3. which在非限制性定语从句做主语时可用各类动词做谓语；而as做主语时，谓语常用系动词，如be, seem,
become等，一般不用其他行为动词。

He saw the girl, which delighted him.

He didn’t say anything at the meeting , as/which seemed very strange.

4. as常用“正如”含义，常用的结构有as we know（众所周知）；as often happens（正如常发生的那样）；as is often
the case（情况常常如此）; as we all can see（正如我们看到的）; be
announced/expected/known/imagined/mentioned/said/shown/

reported等。这些结构常放句首，偶尔也可以放句中或句末。

As is known to all, China is a developing country.

Kate was late for school, as often happened.

as还有当......的意思追答亲如果对我的回答还满意的话，给个好评把，谢谢亲！！^ω^加油哦或者你也可以关注我，不理解可以继续追问哦

as不只是正如的意思，as有很多意思，而且它作为一个连词可以根据整句的意思做出适当的改变，这里翻译为一旦比较好追答或者是当，，，，这个更为确切

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