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| 71. | a natural pearl |
| 天然珍珠 |
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| 72. | organic gardening is more natural; nonsynthetic fertilizer. |
| 有机园艺更趋于天然；天然肥料。 |
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| 73. | natural antibody |
| 天然抗体 |
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| 74. | loadstone; lodestone |
| 天然磁石 |
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| 75. | natural gem |
| 天然宝石 |
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| 76. | superfine natural goods (products) |
| 天然精品 |
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| 77. | uranium of natural enrichment |
| 天然浓缩铀 |
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| 78. | natural pollution sources |
| 天然污染源 |
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| 79. | An evident principle |
| 天然之理 |
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| 80. | a gas field |
| 天然气田 |
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