We do know the fact that the earth is made up of the ocean and  the continent . The ocean is seventy percent  of the surface  on the earth. The ocean is the life of  origin .Chairman Mao stated that  the human must always be victorious than nature. So ,people build a lot of building such as road ,house, reservoir and more. However for now ,the man know that people is a part of mother nature. Therefore, people should live in harmony with nature.