这款学习应用是一个很好的激励者，完成每日任务后会给予积分奖励。

This learning app is a great ___reward, giving points after completing daily tasks.

这个健身应用就像一个激励器，每次锻炼后都会给你虚拟货币奖励。

This fitness app acts as a ___rewarder by giving you virtual coins after each workout.