Height: the altitude of your observing site above the mean sea-level, in meters.
海拔：你的观测地点的海拔高度，单位是米。
Mean low water (MLW) is the average height of all low waters at given place.
平均低水位(MLW)为给定地区所有低潮位的平均值。
Mean low water (MLW) is the average height of all low waters at given place.
平均低水位(MLW)为给定地区所有低潮位的平均值。
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