it's survival of the fittest 适者生存

【讲解】

survival的本义是生存”，fittest的本义是“最适合的”。该习语的字面意思是“最适合者得以生存”，意即“适者生存”。该习语源自达尔文“物竞天择，适者生存”的立论。

【对话】

A:Where is John studying?

A:约翰在哪儿上学？

B:He's at the Seals Naval Academy.

B:席尔斯海军学院。

A:How is he getting along there?

A:他在那儿混得如何？

B:He's having a hard time. It's survival of the fittest.

B:可不好混哦，那可是个适者生存的世界。