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| 71. | native sulfate of barium |
| 天然硫酸钡 |
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| 72. | An evident principle |
| 天然之理 |
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| 73. | superfine natural goods (products) |
| 天然精品 |
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| 74. | natural draft ventilation |
| 天然通风 |
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| 75. | a natural pearl |
| 天然珍珠 |
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| 76. | a gas field |
| 天然气田 |
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| 77. | natural pollution sources |
| 天然污染源 |
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| 78. | natural consolidatio |
| 天然胶结 |
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| 79. | loadstone; lodestone |
| 天然磁石 |
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| 80. | natural exposure |
| 天然露头 |
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