名词
中文翻译：亚音速速度
同义词：
['subsonic', 'subsonic velocity']
例句：
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1.The aircraft is traveling at a subsonic speed of 900 km/h.
飞机以900公里每小时的亚音速飞行。
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2. The sound waves are traveling at a subsonic speed.
声波以亚音速传播。
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3. The projectile is traveling at a subsonic speed.
弹头以亚音速移动。