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A number selected from a given set of numbers in such a way that all the numbers in the set have the same chance of selection.
1920s; earliest use found in Biometrika.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。