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tricone bit
dril.	三牙轮钻头
eng.geol.	三锥形钻头
oil	三刃钻头
tech.	三锥齿轮钻头
tricone rolling cone bit
expl.	三牙轮钻头具有破裂作用的牙轮钻头,由三个装有钢齿或硬质合金镶嵌的锥形轮组成

tricone bit: 9 phrases in 3 subjects

Drilling	1
Oil / petroleum	3
Technology	5