以下为句子列表：
英文: A US military helicopter has gone down northwest of Baghdad with Sunni insurgents tied to Al-Qaeda claiming responsibility. All seven aboard the Marine Sea Knight Chopper were killed.
中文: 一架美军直升机在巴格达西北部地区坠毁，一个同基地组织有关系的迅尼派武装人员宣称对此事件负责。这架“海上骑士”大型直升机上7名官兵全部丧生。
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英文: A hard landing for a U.S. army helicopter in Iraq, injuring both crew members. The military says it appears the chopper had a mechanical problem.
中文: 一架美军直升机在伊拉克迫降，机上人员都受伤。军方称可能是直升机的机械问题。
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英文: A man who went berserk in his Tsuen Wan flat with a chopper died after being subdued by policemen using pepper spray yesterday.
中文: 一名男子昨日在荃湾住所发狂，挥舞菜刀，警察以胡椒喷雾将该名男子制服，他其后死去。
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英文: A news chopper decided to help out struggling deer by using its powerful rotor to actually blow the animal off the ice where was stuck and then back onto land.
中文: 一架新闻报道的直升机决定帮助挣扎的小鹿摆脱困境,它利使用威力十足的旋翼把陷入冰块里的小鹿的吹回到陆地.
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英文: A novel three-level AC chopper is proposed, which is a new multi-level converter applied to high voltage conversion, and utilizes more electric levels to form output voltage and decrease the harmonic content of output waveform.
中文: 摘要提出一种用于高压电能变换的新型三电平交流斩波电路，该电路允许使用低电压等级的器件完成高压电能变换，并采用较多的电平数去逼近所希望的波形，使输出电压或电流的质量大大提高，谐波含量减少。
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