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| reflection echo; reverse echo | |||
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反射回波 : 21 phrases in 9 subjects |
| Acoustics | 1 |
| Air defense | 5 |
| Construction | 1 |
| Electronics | 1 |
| General | 1 |
| Geophysics | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 3 |
| Technology | 7 |
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