spurrer

例句：

1. 1.The sudden drop in temperature was a great spurrer for the winter sports season.
   温度的突然下降为冬季运动季节提供了极大的激励。
2. 2.The new software is a powerful stimulator of productivity.
   这款新软件是提高生产力的强大工具。
3. 3. The teacher's lecture was a great spurrer for her students to improve their studies.
   老师的讲座极大地激励了她的学生们改善学习。