1. Expression：hit the nail on the head
Explanation：To describe a situation or problem exactly.. （切中要害，说话中肯，非常准确地描述某种情况或某个问题）
Example：Duncan Smith hit the nail right on the head when he said that the Prime Minister promised so much and yet changed so little.
He hit the nail on the head when he mentioned that the company was actually facing the danger of bankruptcy.
I agree with Dr Carey in everything he says. I think he's hit the nail right on the head.
A: Jane, what are you doing?
B: I am listening to the president’s speech. His talk on the economic situation just hit the nail on the head.
2. Expression：holy shit
Explanation：An exclamation of surprise, shock, or astonishment. （表示惊讶，震惊等意思的感叹词）
Example：Holy shit, the bill for the dinner is nearly $200!
We won the lottery? Holy shit, that's amazing news!
Holy shit, you dare to shoot me!
Holy shit, we have to work overtime without pay again。
3. Expression：shit for brains
Explanation：Someone who is very stupid or incapable of learning something. （傻子，愚蠢的人）
Example：I scolded the shit for brains well for listening to that tale.
I'll never understand how that shit for brains got promoted.
A：Did you really put a pizza in the oven for 30 minutes without first turning it on?
B: Yeah, what is wrong? 是呀，怎么啦？
A: Come on, shit for brains, use some common sense. 得了吧，傻瓜，懂点常识吧。