N a syntactic construction, often considered ungrammatical in standard Modern English, in which two negatives are used where one is needed, as in I wouldn't never have believed it 双重否定
I think using unless with else is like speaking with double negatives.
我认为使用unless加else条件句就好像在讲双重否定。
The poor grammar, unconventional double negatives and monotonous sentential patterns form the typical features of Gumps language.
蹩脚的语法，非常规的双重否定和结构单一的表达构成了他句法层面的显著特色。
As you iterate over the query expressions, your algorithm may need to correct for double negatives. Consider a query expression like this one.
在遍历查询表达式时，算法可能需要纠正双重否定。
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