“否定”搜索（Search for negation）

You can narrow your search results by excluding words with the NOT syntax.
通过“NOT”语法，可以搜索不包含该词的节点。

Single terms, phrases, and so on can be combined using “NOT” in upper, lower, or mixed case, or prefixed with “!” or “-“.
单个术语、短语等可以使用大写、小写或混合大小写中的“NOT”组合，也可以使用前缀“！”或“-”。

yellow NOT banana
yellow !banana
yellow -banana
NOT yellow banana
-yellow banana
!yellow banana

The NOT operator can only be used for string keywords; it doesn’t work for numerals or dates.
NOT运算符只能用于字符串关键字；不能用于数字或日期。

Prefixing any search qualifier with a - excludes all results that are matched by that qualifier.
在搜索语句前加“-”，将排除符合该搜索语句的结果。