There is an exception to this grammatical rule.

这条语法规则有个例外.

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Mary seems as though she understands the grammatical rule.

玛丽看起来好像明白了这一语法规则.

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There is no grammatical rule that has no exception.

条条语法规则都有例外.

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There is no grammatical rule but has exception.

这一规则实际上有例外.

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