To communicate the need for (someone) to return from one situation or location to a previous one:召回：通知需要（某人）从现状或位置返回到先前的状况或位置：Management called the laid-off workers back.经理召回了被解雇的工人们
To telephone or radio (a person) who has called previously:回电话：打电话或回信号给先前曾打来电话的（某人）：I called her back at noon.中午我回她电话
To recall (a defective product) for repair:收回处理：调回（有缺陷的产品）以供修复：The company has called back all such models built in 1990.公司已收回所有1990年的机型以便修理