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| 51. | The wind whirled across the steppes. |
| 风儿回旋过台阶 |
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| 52. | sequential steps |
| 顺序阶梯|顺序台阶 |
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| 53. | bench mining method |
| 台阶式采煤法 |
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| 54. | natural gem |
| 天然宝石 |
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| 55. | An evident principle |
| 天然之理 |
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| 56. | natural antibody |
| 天然抗体 |
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| 57. | spread varnish on the steps. |
| 在台阶上涂漆 |
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| 58. | uranium of natural enrichment |
| 天然浓缩铀 |
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| 59. | organic gardening is more natural; nonsynthetic fertilizer. |
| 有机园艺更趋于天然；天然肥料。 |
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| 60. | superfine natural goods (products) |
| 天然精品 |
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