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| 51. | a flat desk; acres of level farmland; a plane surface. |
| 平坦的课桌；成亩的平坦农田；平坦的表面。 |
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| 52. | flat terrain |
| 平坦地区 |
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| 53. | scraper ground plate |
| 扒斗底板 |
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| 54. | subdued topography |
| 平坦地形 |
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| 55. | adjustable shoe sole |
| 可调刹车底板 |
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| 56. | enlarging board |
| 放大机底板 |
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| 57. | inverted-arch floor |
| 倒拱底板 |
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| 58. | subdued mountains |
| 平坦山 |
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| 59. | as flat as a Board |
| 非常平坦 |
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| 60. | smooth fracture |
| 平坦断口 |
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