A: Bob refused all his classmates' invitation.

鲍勃拒绝了班上所有人的邀请。

B: I really could not understand him.

我真的不明白他这个人。

A: He's surely a hard nut. Nobody likes approaching him.

他真是个脑子不开窍的人，没人愿意接近他。

B: We'd better also leave him alone.

我们最好也别惹他。

01 hard nut

难对付的人；顽固不化的人；不容易了解的人

He's a hard nut; he won't back down easily.

他是个硬汉，不会轻易让步。

hard nut to crack

难对付的人；棘手的事

This math problem is a hard nut to crack.

这个数学题很难解。

He is a hard nut to crack, but we managed to negotiate a deal with him.

他是个难缠的人，但我们设法与他谈判达成一致。

My manager is a hard nut to crack. He always shouts at me about what I have done.

我的经理是个难对付的人，他总是针对我做的事情对我大吼大叫。

The old computer is a hard nut to crack, it keeps crashing, and we can't figure out the problem.

这台旧电脑是个难题，总是死机，并且我们无法找到问题所在。

The problem of hunger worldwide is a hard nut to crack. I'm afraid that scientists need to put in more efforts.

全球性饥饿问题是个棘手问题，恐怕科学家需要付出更多的努力。

02 approach

接近/靠近某人或某地

The train approached the station.

火车靠近车站。

The airplane approached the runway, preparing for landing.

飞机靠近跑道，准备降落。

As I approached the park, I could hear the laughter of children playing.

当我走近公园时，我能听到孩子们玩耍的笑声。

03 leave sb alone

让某人单独待着，不要打扰或者干涉某人

Can you leave your brother alone? He's trying to study.

你能让你的弟弟单独待会吗？他正在学习。

I need some time to think, so please leave me alone.

我需要一些时间来思考，所以请让我单独待会。

He's in bad mood, so it's best to leave him alone.

他心情不好，最好别打扰他。