The act of striving to realize it tests its worth. 努力实现这个目的的行动才能测验它的价值。
A battery of tests and examinations will identify the best candidate and a back-up astronaut, who will undergo18 months of training in Star City, Moscow. 以一连串测验和调查,确认最佳候选人和候补太空人,到莫斯科星城接受十八个月的训练。