Call-back Time 回电时间
I'll call back at a more convenient time.
在方便的时候我会回电话的。
Forget the lag time of email or waiting for a call back.
不再需要无止境地等待电子邮件或者是电话回复。
Synchronous calls can be programmed, but with timeouts so that if the call can't come back in a certain time, the calling Web service can be unlocked to exit from the system.
同步调用可以通过编程来实现，但带有超时设置，如果调用在一定的时间内未返回，调用Web Services可能取消锁定，从而从系统退出。
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