短语
双轮环式滑车
double wheel pulley
双轮铁滑车
double iron pulley block
双轮转环滑车
double-pivoting block
双轮滑板车
two wheel scooter
双轮木滑车
double-sheave wooden block
双轮千斤索滑车
double-sheave top lift block
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double block
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double block
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double sheave pulley
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