名词
中文翻译：跑道净空
同义词：
['clearance runway', 'taxiway clearance例句：1. The pilot cleared the runway before taking off.（飞行员在起飞前清理了跑道。）2. The airlines are required to maintain a minimum clearance of 500 feet above the ground.（航空公司需要保持至少500英尺的地面高度。）3. The aircraft was cleared for takeoff by the air traffic control tower.（飞机被空中交通管制塔批准起飞。）']
例句：
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1. The pilot cleared the runway before taking off.
飞行员在起飞前清理了跑道。
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2. The airlines are required to maintain a minimum clearance of 500 feet above the ground.
航空公司需要保持至少500英尺的地面高度。
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3. The aircraft was cleared for takeoff by the air traffic control tower.
飞机被空中交通管制塔批准起飞。