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序言我們正生活在一个科学和技術蓬勃發展的时代。像原子能利用、超音速飛行等这样一些任务,不久以前还認为是空想的,而今天已經在实踐中得到了解决。宇宙飛行的問題已經提到日程上來了。
Preface We are living in an age where science and technology are flourishing. Some tasks such as atomic energy utilization and supersonic flight were not long ago thought to be utopian and have been solved in practice today. The issue of space flight has come to the agenda.