call-back devices户的身份认证;回叫
Call-back model回调模式
automatic call-back自动回叫
call-back marker应答浮标;重返声控定位浮标
call-back lock缓冲锁
call-back program回调程序
call-back message召修信息
call-back service回拨服务
Call-Back Mail召回类邮件;召回类邮件指的是一封电子邮件主要被用于针对流失客户的召回及唤醒
PHRASAL VERB（动词词组） If you call someone back, you telephone them again or in return for a telephone call that they have made to you. 给…回电话
If we're not around, she'll take a message and we'll call you back.
如果我们不在，她会帮忙传话，我们会给你回电话的。