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| 51. | trace contaminant |
| 残余污染物 |
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| 52. | trace element |
| 痕量元素 |
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| 53. | Trace elements |
| 微量元素 |
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| 54. | trace conditioning |
| 痕迹制约(心理学) |
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| 55. | executable trace |
| 可执行跟踪 |
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| 56. | trace condition |
| 迹条件 |
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| 57. | unstacked trace |
| 未叠加道 |
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| 58. | Without trace |
| 不着痕迹 |
|
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| 59. | trace components |
| 痕量组分 |
|
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| 60. | subsurface trace |
| 界面反射点轨迹 |
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