Verb + 中
中 (zhōng) as a noun means "middle" or "center," and it is also used to indicate that something is in progress or in a certain state. When placed after an action, 中 signals that the action is ongoing. For instance, 进行中 means "in progress."
会议正在进行中,请稍等一下。
Huìyì zhèngzài jìnxíng zhōng, qǐng shāo děng yíxià.
The meeting is in progress; please wait a moment.
他站在房间中间,不知道该往哪走。
Tā zhàn zài fángjiān zhōngjiān, bù zhīdào gāi wǎng nǎ zǒu.
He stood in the middle of the room, not knowing which way to go.
装修中,暂停营业,下周一重新开门。
Zhuāngxiū zhōng, zàntíng yíngyè, xià zhōuyī chóngxīn kāimén.
Under renovation, temporarily closed. Reopening next Monday.