形容词
中文翻译：亚音速的
同义词：
['subsonic', 'subsonic例句：1. The aircraft is traveling at a speed of 200 miles per hour', 'which is subsonic.（这架飞机以每小时200英里的速度飞行，这是亚音速。）']
例句：
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1. The aircraft is traveling at a speed of 200 miles per hour, which is subsonic.
这架飞机以每小时200英里的速度飞行，这是亚音速。
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2. The sound waves are traveling at a speed of 500 meters per second, which is subsonic.
声波以每秒500米的速度传播，这是亚音速。
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3. The wind is blowing at a speed of 10 mph, which is subsonic.
风以每小时10英里的速度吹过，这是亚音速。