Zài yōushèng-liètài de jìngzhēng zhōng, bú jìnbù jiù děngyú luòhòu.
In a survival-of-the-fittest contest, standing still is the same as falling behind.
Tips
memory
Two mirrored halves: 优胜 the better ones win, 劣汰 the poorer ones are washed out. That last character is the one in 淘汰, originally rinsing grain so the bad kernels float away.
usage
In Chinese this is business talk far more than biology talk: markets, industries, job competition. 市场优胜劣汰 sits close to a cliché in commentary.
