“敲門磚”，字面意思指“揀來敲門、門開後即被丢棄的磚頭（brick picked up to knock on the door and thrown away when it has served its purpose）”。常用來比喻世人借以獵取功名的工具（thing used as a means for fame and position），一達目的，即可抛棄。
與“敲門磚”意思相近的表達還有“墊腳石”，兩者都可以翻譯為“a stepping stone to success”。
例句：
有些人常把讀書當成“敲門磚”，一旦功名到手，書籍也就被束之高閣了。
Some people take attending to school only as a stepping stone to status; once they succeed, all the books will be shelved.
他甘願當墊腳石。
He is willing to be a stepping stone.
（中國日報網英語點津 董靜）
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