By 1982, she was restless and needed a new impetus for her talent.
到1982年，她焦躁不安，需要一个新的对其才华的推动力。
《柯林斯英汉双解大词典》
2
And some people take this a step further, and they hypothesize that this migration actually provided an important impetus in the development of ancient Egypt.
有些人对这方面做了进一步的研究，并假设这次的迁移实际上为古埃及的发展提供了一个重要的动力。
3
One impetus for the policy is that companies are already starting to build massive constellations, comprising hundreds or thousands of satellites with many moving parts among them.