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11. | echo acquisition |
| 回波捕捉 |
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12. | CERES (Combined Echo Ranging Echo Sounding) |
| 统一的回声测距与测深 |
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13. | radar echo |
| 雷达回波 |
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14. | echo experiment |
| “回声”试验 |
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15. | Echo height |
| 回波高度 |
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16. | echo chamber |
| 回声室, 反响室 |
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17. | Control echo |
| 参考回波 |
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18. | echo cancellation |
| 回波对消;双回路对消;重影消除 |
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19. | Echo indication |
| 回波指示 |
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20. | echo microphone |
| 回声传声器 |
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