不变异性 its immutability contra mortality and phenomenal variation
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Indefinite variability is a much more common result of changed conditions than definite variability , and has probably played a more important part in the formation of our domestic races 不定变异性比起一定变异性,更常常是改变了的条件的更普通的结果,同时在我们家养族的形成上,它大概会起更重要的作用。