...中 marks process/in-progress state (in the middle of ... / during ...), often in formal notices and written discourse.
Process frame - event/activity currently underway
Temporal embedding - during/in the course of X
Formal concise style - frequent in reports and announcements
See examples below for varied real-world usage.
Usually attaches to nominalized process phrase
- e.g., 進行中, 使用中, 會議中.
Register often formal
- Spoken alternatives may use 在...呢 etc.
Avoid ambiguity about what is in progress
- Keep process noun explicit.
The system is under maintenance, please try later.
The meeting is in progress, please do not disturb.
He is currently on a business trip.
The document is under review.
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