We need it to complete the clause in the sentence.

我们需要它来完成句子中的子句。

We discussed relative clauses in an earlier Everyday Grammar story.

我们在之前的每日语法已讨论了关系从句。

You can also reduce the clause in a sentence to a phrase.

你也可以把句子中的从句变成一个短语。

Without it, we're still going to understand the clause in the sentence.

没有它的话，我们还可以理解句子里面的从句。

The second is we can leave out the word " that" in noun clauses, especially in everyday speech and writing.

第二，我们可以在名词从句中省略“that”，尤其是在日常口语和写作中。

To use relative clauses in this way, you need to do two things.

要以这种方式使用关系从句， 您需要做两件事。

Because sometimes you want to place your clauses in a relationship that makes sense.

因为有时你想把你的子句放在一个有意义的关系中。

I know, but Sheldon had this clause in the Relationship Agreement forbidding cosmetic surgery unless it's to look like a Klingon.

我知道，但谢尔顿在《恋爱协议》里明文禁止做美容手术，除非做出来效果像克林贡人。

When a bill is hundreds of pages long, it is not hard for congressmen to slip in clauses that benefit their chums and campaign donors.

如果某项议案长达数百页，而对于国会议员来说，想要悄悄加进去某些条款以让 他们的密友和竞选捐款者获益简直易如反掌。