Ship or boat refers to pulling, pulling, pushing, rowing or pushing the propeller and high-pressure nozzle by using the buoyancy of water and relying on the power of manpower, sails and engines (such as steam engines, gas turbines, diesel engines and nuclear power plants).
A vehicle that can move on water. In addition, civilian ships are usually called boats (junk in ancient times), ships, airplanes and boats, military ships are called ships (junk in ancient times) and warships, and small ships are called boats, junk, rafts or boats, collectively referred to as ships or boats.
Ships are developed with the development of human beings. Whether in wartime or in peacetime, there are ships. Millions of fishermen around the world use fishing boats to catch fish. Wartime naval warfare and maritime munitions are all related to ships.
In 2007, there were about 35,000 merchant ships carrying 7.4 million tons of cargo. By 20 1 1 year, about 104304 ships in the world have obtained IMO numbers.
Historically, ships have played an important role in geographical exploration and scientific and technological development. Like Zheng He of the Ming Dynasty in China, he spread the compass and gunpowder to other areas.
Ships can be used for colonial and slave trade purposes, as well as for science, culture and humanitarianism. The Columbus exchange between America and Europe was one of the main reasons for the world population growth at that time. Shipping also makes the world economy an energy-intensive economy.
In the usual sailing tradition, ships usually have their own names, and modern ships may have a class (usually named after the first ship in this class). In English, a ship is usually called "she or she", even if the name of the ship is a man's name. But this is not absolute. Some writing guides also use "it" to refer to the ship.
Generally, common ships are monohull ships. A twin hull has two slender hulls and a main deck and superstructure. It uses a turbine nozzle engine, and obtains the reaction force by spraying water backwards, which is faster than ordinary propellers. At high speed, the slender hull of the catamaran can reduce the resistance.
Moreover, the stability of the hull is high, and it is not easy to capsize (but if the wind and waves are too big, after turning over 90 degrees, there will be disaster because there is no static stability righting moment of a single ship). It is often used in ferry and military transportation.