直升机攻潜策略是反潜战中值得研究的一个问题。
The attacking tactic of helicopters against submarines is a problem that is worth studying.
弓箭作为攻战守城的武器，曾走过一段辉煌的历史。
As weapons of long shot, bow and arrow had bright moments in history.
弓箭作为攻战守城的武器，曾走过一段辉煌的历史。
As weapons of long shot, bow and arrow had bright moments in history.
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