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》

Always keep your door/inbox open - You never know who is going to walk through your door + contact you.

十 敞开你的大门和邮箱——你永远不会知道谁会走进你的家门来与你联系。

youdao

Some people keep the door closed while others keep it open.

有些人关着这扇门，而有些人则敞开着。

youdao

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

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

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'