Another solution is to rethink your categories so that users don't find an empty category.
另一种解决方案是重新考虑划分类别，以便用户不会看到空类别。
The theory of Empty Category is one of the most important parts in Government-and Binding Theory.
空语类理论在管辖与约束理论中占有十分重要的位置。
The theory of Empty Category is one of the most important parts in Government-and Binding Theory.
空语类理论在管辖与约束理论中占有十分重要的位置。
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