名词
中文翻译：直接航线
同义词：
['direct flight', 'direct route']
例句：
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1.The airline offers direct air routes to major cities in the United States.
该航空公司提供直达美国主要城市的航线。
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2. Direct air routes are essential for emergency medical transport.
直达航线对于紧急医疗运输至关重要。
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3. The company has expanded its direct air routes to more destinations.
该公司已将其直达航线扩展到更多目的地。