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。

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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。

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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。

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