1. a wearing down to weaken or destroy. 
   导致削落或毁坏的磨损。
2. The nap is worn. 
   细毛磨损了。
3. The gears work against each other. 
   齿轮互相磨损
4. The rear tires began to wear. 
   后胎开始磨损
5. To damage, as by heavy wear. 
   磨损，损坏

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