n.自然选择，物竞天择说...

natural selection的音标：natural selection的英式发音音标为：['nætʃərəl si'lekʃən]natural selection的美式发音音标为：['nætʃərəl sɪ'lɛkʃən]...

the theory of natural selection, first propounded by Charles Darwin查尔斯∙达尔文首先提出的物竞天择理论Natural selection ensures only the fittest survive to pass their genes on to the next generation.自然选择确保只有最适应环境的物种得以存活下来，把基因传给下一代。All ba...