在 + Noun + 中
The character 中 (zhōng) can function as a verbal element meaning 'in the midst of' or 'within a process,' indicating an ongoing state or condition. It appears in constructions like 在梦中 (in a dream) and 在进行中 (in progress) to express that something is currently happening.
他还在考虑中,没有做决定。
Tā hái zài kǎolǜ zhōng, méiyǒu zuò juédìng.
He is still thinking it over and hasn't made a decision.
孩子们在睡梦中笑了起来。
Háizimen zài shuìmèng zhōng xiào le qǐlái.
The children smiled in their sleep.
这个项目正在进行中。
Zhège xiàngmù zhèngzài jìnxíng zhōng.
This project is currently in progress.