动词短语
中文翻译：允许降落
同义词：
['permit', 'allow', 'grant permission to land']
例句：
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1. The pilot musthave a permit to land in this restricted airspace.
飞行员必须持有在这片受限空域降落的许可。
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2. The plane was denied permission to land due to bad weather conditions.
由于恶劣天气条件，飞机被拒绝降落。
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3.The pilot had to exercise caution when landing at the airport due to heavy fog.
在机场降落时，飞行员不得不小心谨慎，因为浓雾。