pyrethrums 

  1. 名詞
pyrethrum複數: 除蟲菊, 除蟲菊殺蟲劑

    
                        
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例句

                

                    
    
                                                    
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                                It is also true that some populations are beginning to show resistance to pyrethrums .                            
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                                Juliet pottered around, touching one flower, smelling another, and finally deciding on some assorted carnations and some deep red pyrethrums .                            
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                                With exception of the pyrethroids, which are photostable modifications of naturally occurring pyrethrums , active ingredients of agrochemicals rarely are chiral.                            
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                                Later, while she was crossing the foyer of the hospital, she stopped to admire the colourful blooms on the flower stall just inside the door - carnations, pyrethrums , freesias and anemones.                            
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                                Controversial natural pesticides include rotenone, copper, nicotine sulfate, and pyrethrums Rotenone and pyrethrum are particularly controversial because they work by attacking the nervous system, like most conventional insecticides.                            
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