pulleys
n.
滑轮（组），滑车( pulley的名词复数 );
皮带轮;
例句:
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Among them were rickshaw pulleys, peddlers, policemen and servants.
这些人有的拉车,有的做小买卖, 有的当巡警,有的当仆人.
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Levers and pulleys are simple machines.
杠杆和滑轮是简单机械.
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a system of ropes and pulleys
绳索滑轮系统
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Older model jetliners used cable and pulleys or pipes carrying hydraulic fluid.
来自WSJ
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But Embro had no pulleys and no container with which to remove debris.
来自NEWYORKER
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They are flexibly connected so that they can be warped slightly by cords passing through pulleys and connected to the levers.
来自SA