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| 41. | lethal threshold |
| 致死阈 |
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| 42. | Threshold voltage |
| 门限电压 |
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| 43. | Threshold level |
| 阀值 |
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| 44. | laser threshold |
| 激光阈|激光阈值 |
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| 45. | tax threshold |
| 起征点 |
|
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| 46. | amplitude threshold |
| 辐度阈值 |
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| 47. | excitation threshold |
| 激励阈值 |
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| 48. | double threshold |
| 双阈 |
|
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| 49. | ecological threshold |
| 生态临界|生态阈值 |
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| 50. | lasing threshold |
| 激光射阈 |
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