敲门的用法和样例：
例句
-
请7点钟敲门把我叫醒行吗？
Would you please knock me up at 7 o'clock? -
她径直走到门口重重地敲门。
She went straight up to the door and knocked loudly. -
进屋前先敲门。
Don't enter without knocking. -
谁在敲门？
Who is knocking at the door? -
有人在敲门。
Someone is knocking at the door. -
你听到敲门声了吗？
Did you hear the knocks at the door? -
有人在猛烈地敲门。
There was a furious knock at the door. -
进来前请先敲门。
Please do not enter before knocking on the door.
