形容词
中文翻译：亚音速的
同义词：
['subsonic', 'subsonic例句：1. The aircraft was flying at a subsonic speed.（飞机以亚音速飞行。）']
例句：
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1. The aircraft was flying at a subsonic speed.
飞机以亚音速飞行。
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2. The sound of the engine is subsonic.
发动机的声音是亚音速的。
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3. The rocket reached subsonic velocity before it exploded.
火箭在爆炸前达到了亚音速速度。