以下为句子列表：
英文: A 500 metre perimeter has been cordoned off around the hole. Authorities had apparently suspected something was wrong with the site before the sinkhole appeared.
中文: 这个地洞周长长达500米。有关当局怀疑地洞的出现是由于事发地有异常情况发生。
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英文: A unit of 25 military paratroopers landed inside the perimeter of a state prison, but not to quell a riot or attempt some movie-script breakout. They just goofed.
中文: 某个25人的伞兵部队降落在一所州立监狱内，不过并不是担负镇暴平乱任务，或发动电影情节般的突围行动。他们只是摆了个乌龙。
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英文: AC square-wave arc welding-its positive and negative half perimeter width can be adjusted and selected the best value SP, It can weld the alloy and alum etc in high quality.
中文: 交流方波氩弧焊，其正负半周宽度可调，可选择最佳SP比值，可高质量焊接铝合金、铝。
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英文: An organization's perimeter defense devices would be overwhelmed by a large attack.
中文: 一个机构的周边防御设备会被大型攻击淹没。
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英文: And while their front line might be as good as any once Yao returns, they probably need more perimeter offense to make a legitimate run.
中文: 尽管随着姚明回归，锋线阵容会十分强，但可能火箭还是需要更多的外线火力。）
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