trigonal 

  1. 形容詞
三角形的, 三角的, 三方晶系的

    
                        
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例句

                

                    
    
                                                    
  1. 
                                Quartz belongs to the trigonal crystal system.                            
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  2. 
                                The trihalides adopt a planar trigonal structure.                            
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  3. 
                                Therefore, the predicted geometry is " trigonal ".                            
    4. 
                                                    
  4. 
                                Citrine is a trigonal crystal of primary formation.                            
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  5. 
                                The trigonal form is obtained by slow cooling from the melt.                            
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