Why oh why do people keep leaving the door open?

人们到底为什么总敞着门呢？

《牛津词典》

To keep the astronauts and the spacecraft safe, the astronauts must leave and go back to the spacecraft through a special door.

为了保证宇航员和飞船的安全，宇航员必须通过一扇特殊的门离开和返回飞船。

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If neighbors are strangers to one another, they are less likely to sweep the sidewalk of an elderly couple living next door or keep an eye out for young trouble makers.

如果邻居彼此都是陌生人，他们就不太可能打扫住在隔壁的老年夫妇门前的人行道，也不太可能留意到一些捣乱的年轻人。

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I cannot live with you, It would be life, And life is over there Behind the shelf So we must keep apart, You there,I here, With just the door ajar That oceans are,And prayer, And that pale sustenance,Despair!

VOA: special.2010.07.18

And it just gonna be... I really look forward to having someone who I can keep speaking to, keep learning from, and keep sharing my ideas with, and keep having that open, just an open door.

将会是，我非常期待,能够有一个像他这样可以一直聊天，一直学习，分享我们的看法，一直可以对他敞开心门。

普林斯顿公开课 - 人性课程节选

House Speaker Pelosi agreed, saying Congress and the Obama administration must keep the door open to additional steps, even as the current stimulus plan begins to work.

VOA: standard.2009.03.10

But "we have to keep the door open and see how this goes, " the California Democrat added.

CNN: Nancy Pelosi open to second stimulus package

So when countries are ready for these various stages, NATO ought to keep the door open for them.

NPR: Rice Seeks More NATO Help in Afghanistan

That could keep the door open for a bigger, more slowly moving asteroid.

BBC: Dinosaur-killing space rock 'was a comet'