Guests who arrive unexpectedly usually have their own agenda.
不速之客通常有他们自己的议程。
You needn't rush around to prepare food and tidy up when guests arrive unexpectedly.
客人到达时你不必找急忙慌的四处准备食物和打扫卫生。
When you analyze a problem, your mind does just what you tell it to, but when you gaze out the window, recollections arrive unexpectedly.
当你在分析一个问题，你的思维完全遵照你的吩咐去做，但是，当你看窗外后，那么回忆不期而至。
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