脱口说英语口语生活习语大全P-13：pop into one's head 突然产生念头

A:迈克答应帮我们了。

B:Mike? How can you trust him to help us?

B：迈克?你怎能相信他的话呢?

A:Why not?

A：为什么不能呢?

B:He's too unpredictable. He says anything that pops into his head. And them he forgets it all.

B:他太让人难以琢磨了，他总是想起什么载说什么，过后就忘得一干二净。