现代不管是内河航运,还是远洋航行,主要的运行工具都是轮船。轮船是一种依靠动力装置带动螺旋桨旋转而前进的水上运输工具。其航行的速度和安全性能是其他水上运输工具难以企及的。明朝时期,我国著名的航海学家郑和曾经7次率众下西洋,曾经经过印度洋到达波斯湾,是当时世界上航海最远的船队。那么他们所使用的船只应该可以说是当时世界上最先进的了。有人说轮船是中国人发明的,而且有着相当先进的技 Modern whether inland shipping, or ocean-going, the main operating tools are steamboats. The ship is a watercraft that depends on the power plant to propel the propeller to rotate. The speed and safety of its voyages are beyond the reach of other water craft. During the Ming Dynasty, Zheng He, a famous navigator in our country, once flew all over the Atlantic seven times. He traveled across the Indian Ocean to the Persian Gulf and was the farthest vessel in the world at that time. Then the ships they used should be arguably the most advanced in the world at the time. Some people say that the ship was invented by the Chinese, and has a very advanced technology