When you come to a closed door, check it with the back of your hand.

当你走到一扇关着的门前时，用手背检查一下。

youdao

He remembers the good old days when everyone in his village knew him and you could leave your door open at night.

他常想起过去的好时光。那时，村里人都认识他，而且大家夜不闭户。

《柯林斯英汉双解大词典》

The days are gone when you could leave your door unlocked at night.

夜不闭户的时代已经一去不复返了。

《牛津词典》

I don't know about that. I am not so sure." But then, we realized that like when we walk out that door, it's the whole world again. So you get sucked up by your group, by your sort of identity.

我不知道，不是很确定，然后呢，我们就意识到走出那个大门，又是一个完整的世界，所以你就会,被你的团体，你的身份所束缚。

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With the one mobile app you can control and check all your household sensors, or you can program Iris to send you text-message alerts when, say, your back door is open.

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