泥沙俱下 mud and sand together
Explanation
比喻好人和坏人混杂在一起，也比喻各种不同性质的事物混杂在一起。
It is a metaphor for good and bad people mixed together, but also for various things of different nature mixed together.
Origin Story
话说古代有个书生，名叫王二，一心想考取功名，光宗耀祖。他去京城赶考，路上遇到一群人，有的是寒窗苦读的学子，有的是江湖骗子，还有的是些游手好闲之徒，真是鱼龙混杂，泥沙俱下。王二初来乍到，不辨真伪，与他们同行了一段路，结果被骗走了盘缠，考试也落榜而归。从此以后，王二明白了社会险恶，不再轻信他人，最终通过自己的努力，金榜题名。
Once upon a time, in ancient China, there was a scholar named Wang Er who longed to achieve fame and honor. On his way to the capital for the imperial examinations, he encountered a motley crew—hard-working students, con men, and idlers—a perfect example of a mix of good and bad. Naive and inexperienced, Wang Er traveled with them for a while, only to be swindled out of his money. He failed the examination and returned home disheartened. This experience taught Wang Er a valuable lesson about the harsh realities of the world. He learned to be more discerning and eventually, through his own perseverance, passed the imperial examinations with flying colors.
Usage
常用来形容社会上好人坏人混杂的现象。也用来比喻各种不同性质的事物混杂在一起。
Often used to describe the phenomenon of good and bad people mixed together in society. It is also used to describe various things of different nature mixed together.
Examples
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网络文学发展迅速，虽然难免泥沙俱下，但总体而言还是欣欣向荣的。
wǎngluò wénxué fāzhǎn sùnsù, suīrán nánmiǎn níshā jùxià, dàn zǒngtǐ éryán háishì xīnxīnxīngróng de.
The development of online literature is rapid, although it is inevitable that good and bad will mix, but overall it is still a flourishing state.
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评论区里观点多样，泥沙俱下，需要认真甄别。
pínglùn qū lǐ guāndiǎn duōyàng, níshā jùxià, xūyào rènzhēn zhēnbié.
The comments are diverse, a mix of good and bad, careful discrimination is necessary.