道路横断面设计是道路设计的重要组成部分。

The cross section design is an important part of the road design.

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设计：以诊断为依据、社区为基础的横断面研究。

DESIGN: a cross-sectional study according to the diagnosis and on the basis of community.

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设计：一项横断面研究。

DESIGN: This was a cross-sectional study.

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设计：一项横断面研究。

DESIGN: This was a cross-sectional study.

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