nerve

The dentist applied a numbing spray to the nerve before pulling the tooth.

(Chinese) 牙医在拔牙前对神经使用了麻醉喷雾。

Damage to the optic nerve can lead to permanent loss of vision.

(Chinese) 视神经受损可能导致永久性视力丧失。

He finally gathered the nerve to ask his boss for a salary raise.

(Chinese) 他终于鼓起勇气向老板提出加薪。

It takes a lot of nerve to perform a solo dance in front of a thousand people.

(Chinese) 在一千人面前表演独舞需要很大的胆量。