valve 
        [vælv]
         
         
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		基本释义:n.阀,阀门,电子管 
		英英释义:a device which opens and closes to control the flow of liquids or gases , or a similar structure in the heart and the veins , which controls the flow of blood
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|          参考例句: 
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                        - 1. The exhaust valve on my car has burnt out. 我汽车上的排气阀烧掉了。
 - 2. The connecting rod may drive a valve stem directly. 连杆可以直接带动阀门的把柄。
  
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