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| 21. | echo ophthalomography |
| 超声波眼查术 |
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| 22. | echo recognition |
| 回波识别 |
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| 23. | echo suppressor |
| 回音消音器 |
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| 24. | unresolved echo |
| 不清晰回声波 |
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| 25. | Parasitic echo |
| 干扰回波 |
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| 26. | echo eliminator |
| 回波消除器 |
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| 27. | echo attenuation |
| 回波衰减;反射衰减 |
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| 28. | echo separation |
| 回波间距 |
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| 29. | echo cardiogram |
| 声纳心电图 |
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| 30. | artificial echo |
| 人造回波;假回波 |
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