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police box; koban; small neighborhood police station
alternation
alternating (current, stress, etc.)
交番で道を聞いてみた。
I asked for directions at the police box.
落とし物を交番に届けました。
I turned in a lost item at the police box.
交番のお巡りさんがとても親切に道を教えてくれた。
The officer at the police box kindly gave me directions.