持续水平面测量数字是由7个观测井公布的，由另外的60个井测得。
Continuous water level data are published for 7 observation Wells and measured at 60 additional Wells.
二是冰川融化，且海平面上升的事实有据可循。 世界各地海域中的海水平面测量仪器共有上千之多，其中一些监测数据甚至可以追溯到18世纪。
And the facts are observable: thousands of gauges—such as that pictured above—measure tides around the world, with some records going back to the 18th century.
帆船进入水的深度，从水平面到龙骨最低处测量。
The depth of a boat in the water, measured from the waterline to the lowest section of the keel.
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