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| 41. | echo ophthalmoscopy |
| 眼底镜检查法 |
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| 42. | ionospheric echo |
| 电离层反射信号 |
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| 43. | Echo frequency |
| 回波频率 |
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| 44. | fluctuation echo |
| 起伏回波 |
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| 45. | Traveling echo |
| 游动回波 |
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| 46. | echo ophthalmometer |
| 超声波检眼计 |
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| 47. | isolated echo |
| 孤立回波体 |
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| 48. | echo suppression |
| 回声抑制 |
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| 49. | echo distortion |
| 回波失真 |
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| 50. | listener's echo |
| 受话者回声，电话回声 |
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