facultative 

  1. 形容詞
特許的, 特準的
(生物學)兼性的, 有條件的
能力上的, 機能上的
偶發的
隨意的, 任意的

    
                        
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例句

                

                    
    
                                                    
  1. 
                                Fish can be obligate or facultative shoalers.                            
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  2. 
                                Monogamy can come in two forms; obligate and facultative .                            
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  3. 
                                Siblicidal behavior can be either obligate or facultative .                            
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  4. 
                                Most are aerobic or facultative anaerobic; few are anaerobic.                            
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  5. 
                                It comprises eight grades, the first of which is facultative .                            
    6.