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| 51. | Country letters |
| 国内信件 |
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| 52. | business correspondence |
| 营业信件 |
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| 53. | confidential letter |
| 亲启信件 |
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| 54. | circulate a letter |
| 传阅信件. |
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| 55. | Courtesy letter |
| 应酬信件 |
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| 56. | Letter Bomb |
| 信件炸弹 |
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| 57. | urgent correspondence |
| 紧急信件 |
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| 58. | allocation letter |
| 拨款信件 |
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| 59. | official correspondence |
| 公事信件 |
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| 60. | duplicate a letter |
| 复写信件 |
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