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小白贼黑
belt tightening pulley; loose pulley
LiaoL童鞋
cruise或loose pulley（cruise更常用）这是我的答案，若满意，请采纳！谢谢！
面包超人311
[Mechanics] a belt tightening pulley; a loose pulley; an idle pulley2.a travelling ship
snowmemory098
1) a travelling ship 2)a belt tightening pulley; a loose pulley; an idle pulley 依据上下文定
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