单词	mean difference
释义	mean difference noun : the average of the absolute values of the n (n −1)/2 differences that exist between pairs in a statistical distribution of n elements Word History First Known Use 1830, in the meaning defined above
随便看	unperch unperched unperches unperching unpercipient unperfect unperforate unperforated unperformable unperformed unperforming unperilous unperishable unperished unperishing unperjured unpermanent unpermissive unpermissivenesses unpermitted unperplex unperplexed unperplexes unperplexing unperson

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