以下为句子列表:
英文: So if you're standing in front of the ultrasonic sound wave, you can hear the sound.
中文: 所以如果你站在超音速声波的前面,你能听到声音。
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英文: The resulting ultrasonic sound wave can then be directed out in a tightly controlled beam.
中文: 由此超声音波可以用严格控制声音的方向。
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