countersink
One who sits with another person at the same desk.
(rare) The study of wood.
a cylindrical recess, typically machined around a hole to admit a screw so that it sits flush with a surface.
(historical) The region of pure light and fire; the highest heaven, where the pure element of fire was supposed by the ancients to exist: the same as the ether, the ninth heaven according to ancien...
棚を組み立てる前に、ねじが表面と同じ高さに収まるよう、穴の周りに円筒形のくぼみを加工してください。
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DiQt（ディクト）
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