V 於 + N is a formal pattern expressing relation/location/origin/target depending on verb semantics, common in written Chinese.
Formal relational marking - links action/state to domain or target
Compact written style - frequent in notices, legal, academic text
Verb-dependent meaning - at/in/to/regarding nuance comes from predicate
See examples below for varied real-world usage.
Meaning must be interpreted with the verb
- 於 itself is highly relational.
Register is formal
- In speech, 在/对/给 etc. may be preferred.
Avoid forced replacement of colloquial patterns
- Use where style calls for it.
These rules apply to all employees.
The meeting is scheduled for next Wednesday.
This measure is beneficial to long-term development.
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