名词
中文翻译：未分类的轨道
同义词：
['unclassified', 'unclassifiedtrack']
例句：
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1. The unclassified track is the most dangerous partof the journey.
未分类的轨道是旅程中最危险的部分。
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2. The unclassifiedtrack was used for testing new technology.
未分类的轨道被用来测试新技术。
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3. Theunclassified track had been closed offdue to safety concerns.
由于安全担忧，未分类的轨道已被关闭。