She has become a bundle of nerves, starting at the slightest sound.

她成了神经过敏的人， 听见一点点声响就惊恐不安。

He is a bundle of nerves.

他是个神经极度紧张的人。

He confessed to having been a bundle of nerves.

他承认自己一直神经极度紧张。

I'm a bundle of nerves when I get in his office.

我一进他的办公室就非常紧张。

He was a bundle of nerves when making the speech.

他在演讲的时候紧张死了。