 |
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| 不可听见的声音 | |||
| 亚声 | |||
| 次声 (波); 亚声 (波，同 infrasonic sound) | |||
| ★ 次声 | |||
| 次声频的 | |||
| 亚音频 | |||
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| 超低频音 (低于15赫兹，人耳无法识别的空气振动频率。) | |||
| Anglais glossaire | |||
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| Very low-frequency sound which can travel long distances and easily penetrate most buildings and vehicles | |||
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infrasound : 6 phrases, 3 sujets |
| Défense aérienne | 1 |
| Espace | 1 |
| Technologie | 4 |