1.动机，目的
2.主题
3.发动力
a.
运动的，成为动机的 词形变化
- 时态 motived，motiving，motives
- a theme that is elaborated on in a piece of music
- causing or able to cause motion
- the psychological feature that arouses an organism to action toward a desired goal; the reason for the action; that which gives purpose and direction to behavior
- impelling to action