自生自灭 self-generation and self-extinction
Explanation
指事物自然发展，无人过问，最终自行消亡。也指对事物放任不管。
Refers to the natural development of things, without intervention, ultimately disappearing on their own. It also means to leave things alone.
Origin Story
在古老的江南水乡，有一片美丽的荷花池。池中荷花种类繁多，红的、白的、粉的，竞相开放，美不胜收。然而，池塘边上，生长着许多杂草，它们与荷花争抢阳光和养料，影响了荷花的生长。一位老园丁看到了这种情况，并没有急于除草，而是耐心地观察。他发现，这些杂草虽然生长迅速，但生命力却相对较弱。而荷花则根系发达，生命力顽强。于是，老园丁不再干预，任凭它们自生自灭。几年后，荷花池里的杂草逐渐枯萎，而荷花却长得更加茂盛，开得更加灿烂。这便是自然界的规律，适者生存，优胜劣汰。
In an ancient water town in southern China, there was a beautiful lotus pond. The pond had many kinds of lotus flowers, red, white, and pink, blooming in competition, beautiful and breathtaking. However, many weeds grew on the edge of the pond, competing with the lotus flowers for sunlight and nutrients, affecting their growth. An old gardener saw this and did not rush to remove the weeds but patiently observed. He found that although these weeds grew rapidly, they had relatively weak vitality. The lotus flowers, however, had well-developed root systems and strong vitality. Thus, the old gardener no longer intervened, leaving them to their own devices. After a few years, the weeds in the lotus pond gradually withered, while the lotus flowers grew even more lush and bloomed even more brilliantly. This is the law of nature, survival of the fittest, natural selection.
Usage
常用来形容对事物放任不管，任其自然发展。
Often used to describe leaving things alone and allowing their natural development.
Examples
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任凭一些小问题自生自灭，反而会造成更大的麻烦。
rèn píng yīxiē xiǎo wèntí zì shēng zì miè, fǎn'ér huì zàochéng gèng dà de máfan.
Letting some small problems fester can lead to bigger problems.
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有些事情，我们不必过分干预，让它自生自灭就好。
yǒuxiē shìqíng, wǒmen bùbì guòfèn gānyù, ràng tā zì shēng zì miè jiù hǎo
Some things we shouldn't interfere with, it's better to let them be.