n.動機；動力；刺激；積極性

Without direction and motivation, a person would not know what to do. 一個人缺乏方向和動力就不知道該干些什么。

The most intrinsic motivation for learning is the child's spontaneous interests. 學習的最為內在的刺激是兒童自發(fā)的興趣。

They lack the motivation to study. 他們缺乏學習的積極性。

動因

adj.激發(fā)性的；動機的