穷究

nǐ bù yào qióng jiū gēn yuán

你不要穷究根源。

Don't make a thorough inquiry into the cause of something.

qióng jiū xià qu hěn fèi shí rì zuì hǎo bù yào yíng tóu qù zhuàng zhè ge wèn tí

穷究下去很费时日，最好不要迎头去撞这个问题。

It takes years to exhaust this topic, so we'd better not meet with this question head on.