call over system的意思|示意

A new system allows a combine harvester, say, to send a call over to a tractor-trailer so the driver can unload the grain as and when necessary.

例如，一种新的系统允许联合收割机向牵引拖车发送呼叫，以便司机可以在必要的时候卸载谷物。

If your phone has a message system, use that instead and call them back when the movie is over.

如果你的手机能够收有信息系统，你可以使用这种功能，这样，在你看完电影后你就能回复。

This means that when your background process actually fires up that UI, the user could be way over in another part of the system, doing something else - such as taking a phone call.

这就意味着当你的后台进程实际弹出一个用户界面时，用户可能已经切换到系统的例外部份并执行其他工作，如打电话等。