英语词汇“first category”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	first category
释义	first category first category [′fərst ′kad·ə‚gȯr·ē] (mathematics) A set is of first category if it is a countable union of nowhere dense sets. A set S is of first category at a point x if there is a neighborhood of x whose intersection with S is of first category.
随便看	oyer oyer and terminer oyer et terminer oyes oyesses oyez oyez oyez oyez oyf oyfa oyfea oyfeta oyff oyfl oyfp oyg oyh oyha oyhs oyi oyirad oyirads oyis oyit oyj oyk

英语词典包含2567994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。