He felt impelled to investigate further.

他觉得有必要作进一步调查。

Hunger impelled him to crime.

饥饿迫使他犯罪。

What motives impelled him to do so?

是什么动机迫使他这么做？

I feel impelled to write a few lines.

我觉得有必要写给你几句话。

She was impelled to look at her husband.

她不由自主地看了看丈夫。