LanGeek
这些形式表明某个类别中不存在人或事物，并且被认为本质上是否定的，这意味着它们可以使句子是否定的。
审查
闪卡
拼写
测验
used to indicate absence or lack of something; it refers to not any or not one of a group
used to say not even one person
not even one person
not a single thing
used to indicate not one and not the other of two people or things
not one nor the other of two things or people
used to show that there is none or almost none of something
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