释义：

believe it 相信

可以将前面提到过的内容替为 it 或 this (that) ,由此而成的 believe it (this, that) 是实际生活中经常使用到的句式，其含义为相信某事。

例句：

You'd better believe it!
你最好相信这个！
Do you expect me to believe that?
你不会是希望我相信那个吧？
I don't believe this! You talked to her about that?
我才不相信这些！你跟她说了？

对话：

A: The stock market just dropped by 200 points.
股市大跌了 200 点。
B: Are you sure? I don't believe it.
你确定吗？真是难以置信。