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| 1. | The waves are sinusoidal in nature, and they have an amplitude and a frequency. |
| 声波实质上是正弦曲线，它有振幅和频率。 |
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| 2. | The ground will not have time to polarize completely and the decay will have a smaller amplitude |
| 地层还来不及充分极化，衰减曲线的幅度将比较小。 |
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| 3. | The ground will not have time to polarize completely anh the decay will have a smaller amplitude. |
| 地层还来不及充分极化，衰减曲线的幅度将比较 |
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