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61. | strictly secret |
| 绝对机密的 |
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62. | official secret |
| 政府机密 |
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63. | secret service |
| 特务组织, 情报部门 |
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64. | Secret Sketchbook |
| 秘密素描薄 |
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65. | secret abutment |
| 暗桥台 |
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66. | secret negotiations |
| 秘密谈判。 |
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67. | secret archives |
| 机密档案 |
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68. | secret dovetail |
| 暗马牙榫 |
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69. | Secret liaison |
| 秘密联系 |
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70. | Chemical Secret |
| 化学机密 |
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