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皮带张紧轮 pídài zhāngjǐnlún
agric. belt tightener
dril. belt stretcher; guide pulley
el. belt tightening pulley
met. belt stretching roller
tech. belting tightener; idler pulley; tightener sheave
皮带张紧 轮: 6 phrases in 3 subjects
Drilling1
Mechanic engineering1
Technology4