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| 31. | Echo width |
| 回波宽度 |
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| 32. | echo fluctuation |
| 回波涨落 |
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| 33. | echo integrator |
| 回声积分器 |
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| 34. | ultrasonic echo |
| 超声回声 |
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| 35. | echo modulation |
| 回波调制 |
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| 36. | Surface echo |
| 表面回波 |
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| 37. | echo ophthalmograph |
| 超声波眼检查仪 |
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| 38. | stationary echo |
| 固定回波 |
|
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| 39. | echo ophthalmoscope |
| 超声波检眼镜 |
|
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| 40. | precipitation echo |
| 【气】降水回波 |
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