[U] eagerness and willingness to do something without needing to be told or forced to do it

动力; 积极性; 兴趣:

efforts to improve employees' motivation

提高员工积极性的努力

Jack is an intelligent pupil, but he lacks motivation.

杰克是一个很聪明的学生，但缺乏积极性。

a high level of motivation

很高的积极性

[C] the reason why you want to do something

动机，原因:

What was your motivation for becoming a teacher?

你为什么当了老师？

Escape can be a strong motivation for travel.

逃避现实有时是旅游的主要原因。

There is suspicion about the motivation behind the changes we are debating.

我们在争论的这场变革，其背后的动机让人怀疑。

motivational speeches

鼓舞人心的演讲