单词	mean square deviation
释义	mean square deviation noun 1 : variance sense 5 2 : standard deviation Word History First Known Use 1920, in the meaning defined at sense 1
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英语词典包含469781条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。