concave 

  1. 形容詞
凹的, 凹面的

    同義字詞
dented,depressed,hollow,indented,recessed,sunken

  2. 名詞
凹面
凹面物
凹曲線
/此名詞複數為"concaves"/

    
                        
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  3. 

    動詞
及物動詞:
把...(物)弄成凹面
使...(物)成凹形
/此動詞過去式與過去分詞為"concaved"/
/現在分詞為"concaving"/
/第三者單數現在式為"concaves"/

    

    
                        
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例句

                

                    
    
                                                    
  1. 
                                Red blood cells are flexible, concave disks.                            
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  2. 
                                The rear portion is concave in mature males.                            
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  3. 
                                It has a concave shape and is probably a cellar.                            
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  4. 
                                Simple quadrilaterals are either convex or concave .                            
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  5. 
                                Larger concave mirrors could be used to light fires.                            
    6.