stubborn
固执的；难对付的  

例句：
(1) The man is as stubborn as a mule.
这个人非常固执。

(2) You'll have to push hard, that door is a bit stubborn.
你得使劲推，那扇门有点难开。

see the light
恍然大悟，同意  

例句：
I didn't approve of his action, but he explained his reason and then I saw the light.
起初我并不赞成他的做法，但经过他解释理由之后，我才恍然大悟。

Let me see.
让我想想   

对话：
A: I'm looking for a shirt for my son.
B: Do you know what size he wears?
A: Let me see. He wears a size 36.
　
A：我想给我的儿子买一件衬衣。
B：您知道他穿多大尺码的吗？
A：让我想想。哦，他穿36号的。