名词
中文翻译：前部开口
同义词：
['frontal opening', 'frontal aperture']
例句：
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1. The frontal aperture of the spacecraft is designed tomaximize efficiency.
该航天器的前部开口设计是为了最大化效率。
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2. The frontal aperture of the helmet is made oflightweight materials.
头盔的前部开口由轻质材料制成。
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3. The frontal apertureof the aircraft is closed during takeoffand landing.
飞机在起飞和降落时关闭前部开口。