木材制作的楔形物。
这些额外的木楔是以防万一的。
一般有三种方法来解决这个问题，圆木榫、饼干榫和木楔。
There are three common solutions to this problem: dowels, joining plates and splines.
全船6个货舱口均系木质舱盖板，面上以三层油布复盖。再以木楔压紧。
All 6 hatches of the vessel had been closed by wooden boards, covered with 3 layers of tar Pauline and held down by wooden wedges.
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