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谐振模 : 27 phrases in 9 subjects |
| Aviation | 2 |
| Drilling | 1 |
| Electronics | 3 |
| Oil / petroleum | 1 |
| Piezoelectric crystals | 10 |
| Space | 1 |
| Technology | 6 |
| Thermal Energy | 2 |
| Wind Energy | 1 |
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