海平面
海平面（英语：Sea level）是地球单一或多个海洋表面个平均水平，由此可以测量诸如海拔等高度。平均海平面（MSL）是一种垂直基准，一个标准化个大地测量参考点。例如制图搭航海中个海图基准面，或是航空中测量标准海平面个大气压力，以便校准飞机个飞行高度。
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