"Altogether 97 % of the water on the earth's surface is seawater, with depths ranging from a few meters to several kilometers deep. The average depth is 4,000 meters, with water below 2,000 meters defined by oceanographers as 'deep-sea water.'
「地球總水量 97 % 是海水，海水淺則幾公尺、深則幾千公尺，平均深度為 4,000 公尺，而海面 2,000 公尺以下就是海洋科學定義的深層海水。