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51. | subvertical shaft |
| 暗竖井 |
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52. | A dull brown. |
| 暗棕色 |
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53. | hammerless gun |
| 暗机枪 |
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54. | flush socket-outlet |
| 暗插座 |
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55. | A dull green. |
| 暗绿色 |
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56. | a secret drawer |
| 暗抽屉 |
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57. | hidden axis,invisible axis |
| 暗轴 |
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58. | invisible stitch |
| 暗缝法 |
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59. | How dark it is! |
| 好暗! |
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60. | dark coniferous forest |
| 暗针叶林 |
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