He speaks knowledgeably about the amount of energy that must be dissipated when a vehicle returns from orbit and the various methods of dealing with the risks.

• 实际上艾伦得到的荣誉是最少的，然而他才是火箭计划中真正必不可少的人，正如同大多数富人所作的那样，他提出自己的计划并提供财力支持和选择合适的人选。