... 一级风 {气} force 1 wind; light air; 一级公路 first-class highway; 一级公式 one-level formula; ...
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the first-class highway 高等级公路
Our nation's first-class highway and the municipal transportation projects have all used four stages predict method to forecast transport demand; majorities of railroad project also use this method.
我国高等级公路及城市交通建设项目。已全部采用四阶段法预测运输需求，绝大部分铁路建设项目也采用四阶段预测法。
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