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He hammered the wedge into the crack in the stone.
他用锤子把楔子砸入石缝里。
《牛津词典》
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The central wedge-shaped stone of an arch that locks its parts together.
拱顶石，塞缝石拱的中部楔形石头，使拱的各个部分连在一起。
youdao
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The central wedge-shaped stone of an arch that locks its parts together.
拱顶石，塞缝石拱的中部楔形石头，使拱的各个部分连在一起。
youdao