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人字形齿轮 rénzìxíng chǐlún
dril. herring bone gear
eng.geol. herringbone gear
shipb. double helical gear
tech. double helical gearing; double helical spurgear; herring-gear
"人"字形齿轮
shipb. double helical gear
人字形齿轮: 1 phrase in 1 subject
Automobiles1