诊所安排了两次回访，以确保术后的恢复情况。

The clinic arranged two ___call-backs to check on the post-surgery recovery.

面试后一周，他收到了复试的通知。

A week after the interview, he got a ___call-back for the second round.

JavaScript允许你将回调函数作为参数传递给其他函数。

JavaScript allows you to pass ___callbacks as arguments to other functions.

客户服务部门会在24小时内给你回电。

The customer service will give you a ___call-back within 24 hours.