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。
Design includes highway route alignment, Horizontal alignment design, Profile design, cross-sectional design, embankment design, road design, and several main parts.
设计主要包括公路选线定线、平面线形设计、纵断面设计、横断面设计、路基设计、路面设计等几个主要部分。
DESIGN: Cluster sampling and cross-sectional investigation.
设计：整群抽样，横断面调查。
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