1. make dull or blunt, as of sharp edges or knives' blades. 
   使锋利的刀刃或刀子的刀片迟钝或生硬。
2. To cut or shape wood with a knife. 
   用刀削用刀子削木头或使木头成形
3. give a fine, sharp edge to a knife or razor. 
   给刀子或刮胡刀一个锋利的边缘。
4. This knife is dirty. 
   刀子脏了。
5. A game in which players toss a jackknife in various prescribed ways, with the object being to make the blade stick firmly into the ground. 
   掷刀游戏参与者以不同的指定方式将刀子掷出并将刀锋深深掷入地面的游戏

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• 1. knife
  are [B:] 是 ( are not = aren’t [B:nt] )...knife [naif] 刀子，小刀...knives[naivz] 刀子（复数）
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• 2. knives
  knife-edge pointer 刀形指针...knives 刀子...knives linear 刀子联线
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  Spoon shaozi 勺子...knife daozi 刀子...Glass beizi 杯子
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  tin (tins) n. 罐头...knife (knives) n. 刀子...fork (forks) n. 叉子
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