On the Chesapeake Bay, historic efforts are underway to protect waters that touch the lives and livelihoods of 17 million people.
在切萨皮克湾正在进行具有历史意义的努力，以保护触及1千7百万人的生命与生计的水资源。
The transformation on mathematical basis of modern historic chart, the correction of the horizontal coordinate and depth data on the charts for the waters off Zhejiang coast are elaborated.
近代历史海图数学基础的转换；浙江海区近代历史海图的平面坐标改正和深度基准面改正。
The transformation on mathematical basis of modern historic chart, the correction of the horizontal coordinate and depth data on the charts for the waters off Zhejiang coast are elaborated.
近代历史海图数学基础的转换；浙江海区近代历史海图的平面坐标改正和深度基准面改正。
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