物竞天择 Natural selection
Explanation
物竞天择，适者生存，指的是生物在生存竞争中，只有适应环境变化的个体才能生存下来，不适应的就会被淘汰。这个概念也广泛应用于社会发展，指在竞争激烈的社会中，只有适应变化、不断进取的个人或群体才能获得成功。
Survival of the fittest, the principle that organisms best adapted to their environment tend to survive and produce more offspring.
Origin Story
远古时代，地球上生存着各种各样的生物。为了争夺食物和生存空间，它们之间展开了激烈的竞争。一些生物因为体格强壮，或者具有特殊技能，能够更好地适应环境，获得更多的食物和生存机会，繁衍后代。而一些生物因为体弱多病，或者缺乏适应环境的能力，最终被淘汰。经过漫长的演化过程，只有那些适应环境的生物才能够生存下来，并不断进化。这就是物竞天择，适者生存。
In ancient times, the earth was inhabited by all sorts of creatures. In order to compete for food and living space, they launched a fierce competition. Some creatures, because of their strong physique or special skills, were able to better adapt to the environment, obtain more food and survival opportunities, and reproduce their offspring. However, some creatures, because of their weakness and illness or lack of ability to adapt to the environment, were eventually eliminated. Through a long evolutionary process, only those creatures that adapted to the environment were able to survive and continue to evolve. This is the survival of the fittest.
Usage
形容生物在生存竞争中，只有适应环境才能生存下来的规律，也用来比喻社会竞争中，只有适应变化才能生存发展的道理。
To describe the law of survival in the biological competition, only those who adapt to the environment can survive, and also to illustrate the reason why only those who adapt to the changes can survive and develop in the social competition.
Examples
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物竞天择，适者生存，这是自然界的普遍规律。
wù jìng tiān zé, shì zhě shēngcún, zhè shì zì rán jiè de pǔbiàn guīlǜ.
Survival of the fittest is the law of nature.
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在激烈的市场竞争中，只有那些适应市场变化、不断创新的企业才能生存发展。
zài jīliè de shìchǎng jìngzhēng zhōng, zhǐ yǒu nàxiē shìyìng shìchǎng biànhuà, bùduàn chuàngxīn de qǐyè cáinéng shēngcún fāzhǎn
In the fierce market competition, only those enterprises that adapt to market changes and constantly innovate can survive and develop.