Finally, of course, there's the question that's dogged every manned flight since the Soviet Union's Yuri Gagarin first went into orbit in 1961: Why bother?
当然最后有一个问题自从1961年苏联的尤里·加加林进入太空以来就一直困扰这我们：“为什么要为登月计划而操心”？
He started dumping the sand in the jar and it went into all the Spaces left between the rocks and the gravel. Once more he asked the question, 'Is the jar full?
他突然把沙往瓶子里倒，沙子漏进了石块与碎石之间残留的缝隙，到不能再倒进沙子时，他又一次问：“瓶子被装满了吗？”
He started dumping the sand in the jar and it went into all the Spaces left between the rocks and the gravel. Once more he asked the question, 'Is the jar full?
他突然把沙往瓶子里倒，沙子漏进了石块与碎石之间残留的缝隙，到不能再倒进沙子时，他又一次问：“瓶子被装满了吗？”
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