敲门砖 如何翻译成英文？

敲门砖
[a brick picked up to knock on the door and thrown away when it has served its purpose―a stepping-stone to success] 拣砖头敲门,门开后即弃砖。比喻谋求名利的手段
这是敲门砖,敲开便丢下他。我们既作了官,做诗何用。――明·西湖居士《春游》

他似认为财富是快乐的敲门砖。
He seems to think that wealth is the open sesame to happiness.

stepping-stone
比喻：进步和成功的方法。
例句：These obstacles his genius had turned into stepping-stones

the key to do sth.