名词
中文翻译：未受保护的飞机
同义词：
['unarmed aircraft', 'unarmed flight', 'unarmed transport']
例句：
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1. The unprotected aircraft was shot down by enemy fighters.
未受保护的飞机被敌方战斗机击落。
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2.The unprotected aircraft was carrying a cargo of gold bars.
未受保护的飞机正运送一批金条。
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3.The unprotected aircraft was forced to land in the deserted airstrip.
未受保护的飞机被迫降落在荒废的跑道上。