The ocean is very important for people. 海洋对人类来说非常重要。

　　It provides them a lot of food, such as fish and shellfish. 它为人们提供很多食物，比如鱼类与贝类。

　　It is also an important source of energy, providing natrual gas and oil. 它还是重要的能源来源，提供石油和天然气。

　　The depth of the ocean usually varies between 5,000-15,000 feet. 海洋的深度在5000英尺到15000英尺（1524-4572米）之间变化。

　　The average depth is about 12,500 feet. 海洋的平均深度约12500英尺（3810米）。

　　The deepest part of the ocean is about 36,000 feet deep. near the island of Guam. 海洋的最深处约36000英尺（约10973米）深，它在关岛附近。