ledge [ledʒ]

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n.壁架，架状突出物；岩架，岩礁

a narrow shelf which sticks out from a vertical surface

They paid out the line to lower him to the ledge. 他们放出绳子使他降到那块岩石的突出部分。
Suddenly he struck his toe on a rocky ledge and fell. 突然他的脚趾绊在一块突出的岩石上，摔倒了。