Ring the doorbell or knock at the door before you enter the room.
在你进入房间之前，按一下门铃或敲门。
It is still five hours before someone will knock on the door, let herself in, and wash you.
照例五个小时之后有人敲你的门，让她进来，为自己刷洗。
Crises don't knock on the door before they appear: challenges of everyday life are there before you are aware of them.
危机在出现之前是不会来敲门的：日常生活的挑战在你觉察到它们之前，就已经在那里了。
You answer the door before people knock.
在有人敲门之前，你就把门打开了。
Please knock at the door before you get in.
当你要进去之前请先敲门。
You should knock the door before you enter.
进门前你应先敲门。
Knock the door before you enter.
进屋之前要先敲门。
Knock the door before you enter.
进屋之前要先敲门。
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