1. To damage, as by heavy wear. 
   磨损，损坏
2. Worn or used until no longer usable or effective. 
   磨损的，损坏的穿破的，用坏的以至完全无用的
3. Gradual impairment or diminution resulting from use or attrition. 
   穿破，磨损因使用或磨损造成的逐渐损坏或减少
4. To break down or exhaust by relentless pressure or resistance. 
   磨损，用坏以不断的压力或阻力使磨损或坏掉
5. Frayed or worn out by use. 
   用坏了的，磨损了的

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• 1. be worn out
  be busy doing 忙于做...be worn out 被磨损、被累坏...be worth doing 值得这样做
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