closed set闭: close; shut集合: gather; assemble; muster; ca ...上闭集合: upper set下闭集合: upper set非相容素闭集合: irredundant prime closed set下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:闭集合,即可在微信中查询翻译