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echo-sounding apparatus |
回声 测声器 : 32 phrases in 13 subjects |
Agriculture | 2 |
Air defense | 1 |
Earth sciences | 2 |
Electronics | 1 |
Fishery fishing industry | 1 |
General | 3 |
Geophysics | 1 |
Oil / petroleum | 2 |
Physical sciences | 1 |
Shipbuilding | 2 |
Space | 1 |
Technology | 14 |
Telecommunications | 1 |