• To measure the difference in elevation between poles, surveyors used an optical levela telescope on a level base—placed halfway between the poles.

    为了测量两极之间高程测量员两极中间一个水平基座使用光学水准望远镜

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  • These are coastal cities, all, thus subject to inundation from the sea or slow draining rivers due to scarce difference in sea level elevation, all signs of sinking.

    这些全都沿海城市因此由于海拔稍稍变化而遭受来自于海洋的洪水河流排水缓慢,这下沉迹象

    youdao

  • These are coastal cities, all, thus subject to inundation from the sea or slow draining rivers due to scarce difference in sea level elevation, all signs of sinking.

    这些全都沿海城市因此由于海拔稍稍变化而遭受来自于海洋的洪水河流排水缓慢,这下沉迹象

    youdao

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