以下为句子列表：
英文: A large planar microphone array,which consists of 111 microphones,was successfully applied to obtain a two-dimensional mapping of the sound sources on a landing aircraft.The focus of study in this paper is on the landing gear noise source.The spectra,dire
中文: 应用由111个传声器组成的平面传声器阵列对当前流行的民用客机进场着陆过程中的机体噪声源进行了实验测量，本文对七架窄体客机和七架宽体客机的起落架噪声进行了分析，得到了起落架噪声的频谱特性、指向特性和声级变化.研究发现，起落架噪声的频谱是由宽频随机噪声与一些较为明显的单音噪声源组成，起落架噪声的指向性类似于一个水平放置的偶极子.不同飞机起落架噪声的声级相差较大，这说明可以通过重新结构设计降低起落架噪声。
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英文: Abstract: A large planar microphone array,which consists of 111 microphones,was successfully applied to obtain a two-dimensional mapping of the sound sources on a landing aircraft.The focus of study in this paper is on the landing gear noise source.The sp
中文: 文摘:应用由111个传声器组成的平面传声器阵列对当前流行的民用客机进场着陆过程中的机体噪声源进行了实验测量，本文对七架窄体客机和七架宽体客机的起落架噪声进行了分析，得到了起落架噪声的频谱特性、指向特性和声级变化.研究发现，起落架噪声的频谱是由宽频随机噪声与一些较为明显的单音噪声源组成，起落架噪声的指向性类似于一个水平放置的偶极子.不同飞机起落架噪声的声级相差较大，这说明可以通过重新结构设计降低起落架噪声。
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英文: At the end of an 18-hour return trip from Manila, as Air Force One is about to begin its descent into Andrews Air Force Base, a cockpit indicator light leads the crew to believe that the landing gear might not be locked down.
中文: 空军一号经过四十八小时飞行，正载著杰克、心静等白宫幕僚回国，当准备降落安德鲁空军基地之际，机师突然发出著陆装置故障的讯息，机组人员在飞机于半空盘旋之际进行抢修及检查。
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英文: Check visually if gear and tyre are intact, do not retract the landing gear until fire is out.
中文: 请目视检查起落架及轮胎是否完整无损，火熄灭后才收上起落架。
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英文: Do I really need the left landing gear assembly?
中文: 我真的需要左边起落架吗？
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