1) a brick picked up to knock on the door and thrown away when it has served its purpose; a stepping-stone to success
敲门砖
5) There was a rap at/on the door.
有敲门声.
6) I knock on the door.
我敲门。
补充资料:敲门砖
比喻谋求名利的初步工具,一达目的,即可抛弃:清朝人称八股文为“敲门砖”,因为得到功名,就如打开了门,砖即无用|读书是一辈子的事,不能把它当作敲门砖。
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