You cannot have a negative sentence after unless because that would make the sentence a double negative and senseless.
在unless之后不能接否定句，因为这就造成了双重否定，句子没有意义。
You cannot have a negative sentence after unless because that would make the sentence a double negative and senseless.
在unless之后不能接否定句，因为这就造成了双重否定，句子没有意义。
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