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Designating a star which is too young (and therefore too bright, hot, or small) to belong to the main sequence on a Hertzsprung-Russell diagram.
1950s.
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。