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| 地面反射菠; 地面回波 | |||
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| 地面回波; 地物回声 | |||
| 地物回波; 地面反射波 | |||
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ground-echo : 5 phrases in 3 subjects |
| Air defense | 3 |
| Technology | 1 |
| Telecommunications | 1 |
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