1. A simple machine consisting essentially of a wheel with a grooved rim in which a pulled rope or chain can run to change the direction of the pull and thereby lift a load. 
   滑轮装置一种有一个拉绳或链子穿过的有槽的轮子且通过改变拉力的方向而拉起重物的简单机械
2. accuracy of kinematical chain 
   传动链精确度
3. chain index of price 
   环比价格指数
4. chain reaction of price 
   价格连锁反应
5. A chain of coincidences. 
   一连串的巧合

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• 1. 简单链
  simple broken line 单折曲线...simple chain 简单链...simple character 简单特贞
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• 2. 简单链系
  simple bill of lading 简式提单...simple chain 简单链系...simple conic projection 单圆锥投影
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