The key is hanging on a string by the door.

钥匙拴在门边的带子上。

《牛津词典》

Quietly he walked towards her, past her, and on towards the heavy oak door. The key twisted in the lock, the shutters closed silently over the windows.

轻轻地，他走向她，慢慢地，走过去，走向那沉重的橡树门。钥匙旋动，锁上了门，窗户也都安静地关上了。

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Such damage is hard to repair and opens the door to further falls as investors focus on lower levels that in the past were key signposts when markets rallied.

这种损坏难以修复，并为进一步下跌打开了空间，因为投资者重点关注一些更低的点位——在以往的上涨中，这是一些关键点位。

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The key system allows given access to the door for particular people, which is on the phone.

FORBES: AT&T Will Transfer Data Through Your Bones

The car detects the proximity of the key and, just as you're about to reach the door, the lights come on and the door handles extend from their normally retracted positions.

ENGADGET: blogger-avatar

We've never felt quite so welcomed as we have when walking up to the Model S. The car detects the proximity of the key and, just as you're about to reach the door, the lights come on and the door handles extend from their normally retracted positions.

ENGADGET: blogger-avatar