rarefaction 

  1. 名詞
(氣體等的)稀薄
(聲音等的)稀疏
純凈
/此名詞可為可數與不可數名詞/
/複數為"rarefactions"/

    
                        
    2. 
                                            

                

            

            
            

                

                
例句

                

                    
    
                                                    
  1. 
                                This rarefaction wave travels back up the tube.                            
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  2. 
                                This index is discussed further in Rarefaction (ecology).                            
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  3. 
                                A wave of rarefaction radiates upward, triggering a downward avalanche of gas.                            
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  4. 
                                The rarefaction is reflected off the sloping end wall of the clarinet mouthpiece.                            
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  5. 
                                The classical elements change into one another by a process of condensation and rarefaction .                            
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