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| 51. | compound source |
| 混声源 |
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| 52. | sintered source |
| 烧结源 |
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| | |
| 53. | specific source |
| 特殊污染源; 特定污染源 |
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| | |
| 54. | external source |
| 外部信源 |
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| | |
| 55. | isotopic source |
| 同位素源 |
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| 56. | isolated source |
| 孤立源 |
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| | |
| 57. | mechanical source |
| 机械震源 |
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| 58. | exposure source |
| 曝光辐射源 |
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| 59. | intermittent source |
| 间歇源 |
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| | |
| 60. | extrastratal source |
| 层外来源 |
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