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超声回声 : 36 phrases in 13 subjects |
| Agriculture | 2 |
| Air defense | 1 |
| Aviation | 2 |
| Earth sciences | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| General | 2 |
| Geophysics | 1 |
| Hydroelectric power stations | 1 |
| Nursing | 2 |
| Plastics | 1 |
| Reproductive biology | 2 |
| Technology | 19 |
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