我需要查明这个问题的原因。
wǒ xūyào chámíng zhègè wèntí de yuányīn 。
I need to find out the reason for this problem.
你能帮我查明他的住址吗?
nǐ néng bāng wǒ chámíng tāde zhùzhǐ ma ?
Can you help me find out his address?
警方正在查明案件的真相。
jǐngfāng zhèngzài chámíng ànjiàn de zhēnxiàng 。
The police are investigating to find out the truth of the case.