Aircraft carrier is a large ship with aircraft as its main combat weapon. It can attack enemy targets at sea and on land by using combat aircraft loaded on board, and can also support other arms to fight. The largest aircraft carrier in the world is the American Nimitz. It is 332 meters long and 40.8 meters wide, with draft 1 1.3 meters and full-load displacement of 9 1487 tons. Three football matches can be held on board at the same time. These two large iron anchors each weigh more than 27,200 kilograms, and it takes 14 trucks with a load of 4 tons to install them. The ship has more than 6,300 crew members and 90 high-performance combat aircraft. There are food, fresh water and a lot of ammunition for more than 6000 people to live for two months.