听力原文： The modern sailing ship was developed by a man who never went to sea. He was Prince Henry of Portugal, the younger son of the Portuguese King and an English princess. Prince Henry lived in the fifteenth century. As a boy he became devoted to the sea, and [18] he dedicated himself to improving the design of ships and the methods of sailing them. In 1416, when he was twenty-two, Henry founded a school for mariners, to which he invited everyone who could help him—Jewish astronomers, Italian and Spanish sailors, and Arab mathematicians and map makers who knew how to use the crude compass of the day and could improve it. [19] Henry's goal was to design and equip vessels that would be capable of making long ocean voyages without having to keep close to the shore. The caravel, which he helped design, carried more sails and was longer and slimmer than any ship then made, yet was tough enough to stand up against gales at sea. He also developed the carrack, which was a slower ship, but one that was capable of carrying more cargo. [20] The world owes credit to Prince Henry for the development of the craft that made oceanic exploration possible. He lives in history as Henry the Navigator. Prince Henry started his school to