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| edge reflection | |||
| boundary echo; boundary reflection | |||
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边界反射 : 9 phrases in 7 subjects |
| Aviation | 1 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 2 |
| Rail transport | 1 |
| Technology | 2 |
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