s. causing or able to cause motion
n. 动机, 目的, 主题, 基调
a. 运动的, 成为动机的
1. She had a strong motive to finish her project on time.
她有强烈的动机按时完成她的项目。
2. The detective was trying to find the motive behind the crime.
侦探试图找出犯罪背后的动机。
3. His motive for helping her was purely altruistic.
他帮助她的动机完全是出于无私。