Her over-confident attitude was a cover for her nervousness.

她以过分自信的态度来掩饰她紧张的心情。

《牛津词典》

In her nervousness she stumbled over her words.

她因紧张说话结结巴巴的。

《牛津词典》

After stumbling over the introduction because of his nervousness, he delivered the rest of the speech smoothly.

由于紧张，他把导言讲得结结巴巴，但是其余部分他讲得很流利。

youdao

The company's wish may finally be coming true--thanks to consumer nervousness over lead-tainted toys.

FORBES: Toy Scare Could Help Wal-Mart

Nervousness over America's corporate pension woes has sparked demand for seminars aimed at educating employees on retirement financing options.

FORBES: Magazine Article

But the regime of Bashar Assad has been quick to exploit public nervousness over religious differences to secure acquiescence in his continued rule.

ECONOMIST: Islam and the Arab revolutions