Subject + 在 + 调查 + 中
调查 (diàochá) means 'to investigate' or 'investigation' and can be used as both a verb and a noun. It refers to the process of examining facts or gathering information about an event. For example, 仍在调查中 means 'still under investigation.'
警方正在调查这起案件。
jǐngfāng zhèngzài diàochá zhè qǐ ànjiàn.
The police are investigating this case.
这件事还在调查中,暂时没有结果。
zhè jiàn shì hái zài diàochá zhōng, zànshí méiyǒu jiéguǒ.
This matter is still under investigation; there are no results yet.
我们需要调查清楚事情的真相。
wǒmen xūyào diàochá qīngchu shìqíng de zhēnxiàng.
We need to investigate and find out the truth of the matter.