敲门砖

  • na.a brick picked up to knock on the door and thrown away when it has served one's purpose
  • 网络First Things First; First Thing First; open sesame

敲门砖敲门砖

敲门砖

na.

1.a brick picked up to knock on the door and thrown away when it has served one's purpose -- astepping-stone to success; ways and means to seek favour

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