名词
中文翻译：导航许可清除
同义词：
['naviclear', 'clearance for navigation']
例句：
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1.The aircraft must clear the navigation clearance before taking off.
飞机在起飞前必须清除导航许可。
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2. The pilot had to clear the navigation clearance before landing.
飞行员在着陆前必须清除导航许可。
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3. The clearance for navigation is crucial for safe operation of the vessel.
导航许可对于船只的安全操作至关重要。