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absorbing material : 17 phrases in 10 subjects |
| Acoustics | 1 |
| Chemistry | 1 |
| Communications | 1 |
| Construction | 2 |
| Environment | 3 |
| General | 1 |
| Health care | 2 |
| Natural resourses and wildlife conservation | 3 |
| Optics branch of physics | 1 |
| Physics | 2 |
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