献给宇航和航空的同业对于天空中的星球,人类很早以前就产生了浓厚的兴趣,然而在几十年前要想接近它们比起一个离奇的梦还不可想象。随着科学技术的飞速发展,现在我们毕竞一步步地向这些天体靠近了。但是在外层空间中我们每前进一步都会在技术上遇到不断出现的新的工程问题,需要新的设备。 Dedicated to Aerospace and Aviation For the planets in the sky, humankind has long had a keen interest in it, yet it was inconceivable to be close to them a few decades ago in contrast to a bizarre dream. With the rapid development of science and technology, we are now approaching these celestial bodies step by step. But every step we take in outer space has technologically encountered new and emerging engineering problems that require new equipment.