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to phrases
annular bit
dril. 环形钻头; 取心钻头
el. 环口钻头
met. 环孔锥; 环状钻头
oil 钻探用的环状钻头
shipb. 环形钻
tech. 圆锯; 环形钻 (头)
annular bit: 1 phrase in 1 subject
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