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61. | level of base plate and support |
| 底板与支座标高 |
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62. | concirculary flat |
| 共圆平坦 |
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63. | flatten out; level out |
| 使平坦 |
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64. | mounting brush of mother-of-pearl |
| 珍珠母制刷子底板 |
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65. | flatness problem |
| 平坦性问题 |
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66. | stone gobber |
| 【采矿】底板清理工 |
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67. | flat-topped surface |
| 平坦面 |
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68. | double bottom tank top plating |
| 双层底内底板 |
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69. | as flat as a pancake |
| 非常平坦 |
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70. | mounting brush of bone |
| 骨制刷子底板 |
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