物竞天择理论究竟是只在自然物质方面起作用呢还是也在精神方面起作用？
Does natural selection only work on physical or it also work on mental as well?
达尔文和华莱士的物竞天择理论都蕴含一个主要的观点：即所有现存和已灭绝的生命形式都起源于同一个共同的祖先。
A major implication of Darwin and Wallace's theory of natural selection is that all life forms, living and extinct, are descended from a single common ancestor.
现在，工程师们发现，“物竞天择”的进化理论在航天器的演进过程中同样会产生惊人的效果。
Now, engineers suggest that the process of natural selection may have surprising implications for spacecraft as well.
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