复数：sheaves 过去分词：sheaved 现在分词：sheaving
1.捆;束(作物等)
1.【机】滑车轮;起重滑轮;绳轮;槽轮;绞缆轮;滑车;凸轮盘
1.a wheel with a grooved rim for a rope, cable, or belt, especially one used as a pulley
1.to gather something, especially the cut stalks of a cereal crop, into a sheaf
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