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“于” is a formal written preposition meaning “on/in/at” for time, often used in news or official writing. It is commonly followed by another location phrase with “在” and a verb like “举行”.
"全球开发者先锋大会于3月27日至3月29日在上海举行。"
“在……期间” means “during…” and introduces a time period. “在……时” means “when…” and sets the time background for another action. Both are very common for describing when something happens.
"大会期间，上海市人工智能行业协会秘书长钟俊浩在接受证券时报记者采访时表示……"
"在接受证券时报记者采访时表示……"
This pattern shows a range, transition, or change from one point/state to another. In this text, it describes AI developing from one role into a more advanced one.
"AI正实现从生产工具到生产力的进阶。"
“在……中” means “in the course/process of …” and is often used in formal Chinese to show that an action happens while another process is unfolding. It can also create a balanced, rhetorical structure.
"行业处于“在前行中探索，在探索中前行”的阶段。"
This structure expresses that both actions or attitudes are unacceptable. It is often used in formal argumentation to present a balanced view: one should avoid both extremes.
"既不能因噎废食，也不能忽视风险。"
to exist; to be alive
safety; security
to explore; to probe
month
(used after an attribute when it modifies a noun)
convention
(dialect) OK; all right
trade; profession; industry; business
specification
season
binding
CL:門|门[men2],種|种[zhong3],項|项[xiang4]
step by step
CL:個|个[ge4]
to accept (a suggestion, punishment, bribe etc); to acquiesce
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