在原始动力时代,人类所创造的一切工具,都只能通过人力或畜力才得以发挥其作用,那是非常微小的力量.也有少数简单地借助风力、水力的动能,但也形成不了规模.生产的发展需要强大的动力!热机使人类摆脱了繁重的体力劳动,促进了生产的发展,带来了工业革命.现代社会在交通、电力工业、航天等很多方面 In the era of primitive power, all the tools created by mankind can only exert their functions through human or animal power, which are very small forces. There are also a few who simply resort to the power of wind and water but can not form any scale. The development needs a strong impetus! Heat engine to human beings get rid of the heavy manual labor, and promote the development of production, has brought the industrial revolution in modern society in the transport, power industry, aerospace and many other aspects