A-9：a hard nut 无知无觉的人

A: Bob refused all his classmates' invitations.

A: 鲍勃拒绝了班上所有人的邀请。

B: I really couldn't understand him.

B: 他这个人我真不明白。

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

A：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.

B：我们最好也别惹他。