He described the process of how new species started as 'natural selection', or 'the survival of the fittest'.

他将新物种的开始称作是“自然选择”，或是“适者生存”。

The law of nature, the survival of the fittest.

自然规律 适者生存。

This principle of preservation, or the survival of the fittest, I have called natural selection.

这种保存原则， 或适者生存， 我称之为自然选择。

He argued that human evolution was characterized by a struggle he called the " survival of the fittest, " in which weaker races and societies must eventually be replaced by stronger, more advanced races and societies.

他认为，人类进化的特点是一场他称之为“适者生存”的斗争，在这场斗争中，较弱的种族和社会最终必须被更强大、更先进的种族和社会所取代。