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How Sound Travels Differently Through Water and Air
声音如何在水和空气中以不同方式传播
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Sound moves faster in water than in air by four times.声音在水中的传播速度是空气中的四倍。
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Water molecules are closer together, passing vibrations more quickly.水分子间距更小，因而能更快传递振动。
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Whales use low-frequency sounds to talk across oceans.鲸鱼利用低频声音跨洋交流。
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Humans hear less underwater because our ears work best in air.人类在水下听力较差，因为我们的耳朵最适应空气中听音。
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Sonar devices send sound pulses to map ocean floors.声呐设备发射声波脉冲来测绘海底地形。
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Cold water carries sound farther than warm water does.冷水比温水传声距离更远。
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Submarines detect ships using echoes from sound waves.潜艇通过声波回声探测船只。
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Studying sound helps us explore oceans and protect sea life.研究声音有助于我们探索海洋并保护海洋生物。