call.back
n.（名词）
The act or an instance of calling back from one location or situation to the previous one:
召回：从某一地点或形势下返回到先前的动作或事件：
例句：
a callback of laid-off auto workers.
召回解雇的汽车工人
A return telephone or radio call.
回答信号：返回的电话或无线电传呼
A recall of a recently sold product by the manufacturer to correct a defect.
收回维修：由制造者为校正缺点而收回最近售出的产品
