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Two thirds of the water on the earth is sea water.
地球上三分之二的水是海水。
Most of this surface is sea, and the water below it—over 97% of the total on Earth—is salty.
太空看地球，水面远远多出地面，水面之下咸涩的海水在地球储水总量中的比重超过了97%。
Low water: the Dead Sea, the lowest spot on Earth, is evaporating at an alarming rate.
图注：降低的水面：死海，地球的最低点，其水分正以惊人的速度蒸发。
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