Because we used a cross - sectional design, causality as implied by this study cannot be firmly established.

由于使用了抽样设计, 研究所暗示的因果关系不能明确确定.

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The cross sectional design of the urban road is the important content in the city construction.

城市道路横断面设计是城市建设中的一项重要内容.

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Limitations to this study include the cross - sectional design and self - report of sun exposure.

此项研究的局限性包括横向设计及 自我 报告日晒情况.

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