n.动机；动力；刺激；积极性
Without direction and motivation, a person would not know what to do. 一个人缺乏方向和动力就不知道该干些什么。
The most intrinsic motivation for learning is the child's spontaneous interests. 学习的最为内在的刺激是儿童自发的兴趣。
They lack the motivation to study. 他们缺乏学习的积极性。
动因
adj.激发性的；动机的
