The nullability characteristics of each column must be the same.
每列的为空性（nullability）特征必须相同。
A journal has its own independent style and column design shows a journals unique characteristics.
期刊的栏目设计关系到刊物个性特色的发挥和社会目标的实现。
A journal has its own independent style and column design shows a journals unique characteristics.
期刊的栏目设计关系到刊物个性特色的发挥和社会目标的实现。
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