pulley

例子: 
The ship had a system of pulleys to help lift the cargo from the dock and lower it into the ship's hold.
it's a foot
http://www.flickr.com/photos/56380734@N05/5401212929/
照片许可: 
CC版权：出处标示，商业用途
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The “ull” Sound (/ʊ/): pulley
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a mechanism with a wheel that is used to pull heavy objects with ropes

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