玉子狗尾草
紧集/紧致集:Compact Set 覆盖:Covering 完备度量空间:complete metric space 稠密集:Dense Set 疏朗集:no where dense set
小聪聪爱妈妈
覆盖 [词典] cover; overlap; plant cover; vegetation; bestrow; [例句]秧苗上面覆盖着塑料薄膜。The rice seedlings were covered with plastic sheeting.
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