敲门砖的英文：
a brick picked up to knock on the door and thrown away when it has served its purpose; a stepping-stone to success

参考例句：
  • Idleness is the key of beggary, and the root of all evil.
    懒惰是行乞的敲门砖，是万恶的根源。
brick是什么意思：
n. 砖；大好人
v. 用砖砌（铺或围堵）
adj. 用砖做的；似砖的
  • They spanned windows with bricks.
    他们在窗子上用砖砌了拱顶。
  • These buildings are made of adobe brick.
    这些建筑都是由风干的砖坯砌成。
  • That brick really hit hard.
    那个重击篮框的球真的撞得很有力。
picked是什么意思：
adj. 精选的；摘下的
v. pick的过去式和过去分词；采摘
  • To pick or try to pick pockets.
    扒窃或企图扒窃
  • Something,such as an ice pick,a toothpick,or a picklock,that is used for picking.
    尖头挖掘工具用来挖掘的工具，如碎冰器、牙签或撬锁工具。
  • pick shirt to pieces
    把衬衣撕开
knock是什么意思：
n. 爆震声；敲；敲打
v. 敲；打；击；批评；撞；（心）怦怦跳
  • Who is knocking the door || Who is knocking || Who is at the door || Who is knocking at the door?
    谁在敲门
  • Who is knocking the door / Who is knocking / Who is at the door / Who is knocking at the door?
    谁在敲门
  • Please knock double knocks at the door before entering.
    请先敲两下门再进来。

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