Which coincide with the mean sea level surface is the geoid.
其中与平均海平面重合的面就是大地水准面。
Mean sea level is an equipotential surface with respect to gravity.
平均海平面就是一个关于重力的等位面。
The level of the ocean's surface, especially the level halfway between mean high and low tide, used as a standard in reckoning land elevation or sea depths.
海洋表面的水位，尤其是在平均高水位和低水位之间的平均位置的水位，用作计算陆地海拔和海水深度的标准。
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