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Pinworms and roundworms are human parasites that hide within the human body, mostly residing in the intestines and stomach.
They incessantly suck plasma and fat day and night, causing illness and gradually leading to the host's death.
Once the person dies, the pinworms and roundworms also dry up and die. Therefore, the life of parasites is not long-lasting.

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Open the tool →蛲蛔之死 (náo huí zhī sǐ) is a Chinese idiom (chengyu) meaning “those who live a parasitic existence”.
蛲蛔之死 is pronounced náo huí zhī sǐ in Mandarin Chinese.
Literally, 蛲蛔之死 means “death of pinworms and roundworms”. It is used to mean “those who live a parasitic existence”.
蛲蛔之死 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
蛲:人体寄生虫;蛔:蛔虫。形容不劳而获者终归会失败