让他们忙起来英文怎么说

在英语中，常用的表达方式是 "keep them busy" 或 "keep them on their toes"。这个短语源自于让某人忙于做事，使他们保持着清醒的状态。

例句：

"I'm trying to keep my team busy with new projects so they don't get bored." (我正在让我的团队忙于新项目，这样他们就不会感到无聊了。)
"The teacher kept the students on their toes by asking unexpected questions." (老师会问出人意料的问题，让学生们保持着清醒的状态。)