The traditional construction of traverse is singly closed traverses, it limits very bigly to construction control and polygonometry.
传统的导线布设形式为单一附和导线，对施工控制和复测导线限制很大。
China a begins construction of world's highest highway tunnel — construction of a tunnel that will traverse Trola Mountain in southwestern Sichuan Province began on Wednesday.
中国开始建设世界最高公路隧道——将横贯四川省西南部雀儿山的隧道工程周三开工建设。
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