| 51. | business correspondence |
| 公务信函
|
| 52. | commercial correspondence |
| 商务信函
|
| 53. | be in constant correspondence with |
| 和…书信不断
|
| 54. | diplomatic correspondence between the United States and Germany |
| 美国和德国之间的外交信札
|
| 55. | carry on an enormous [a heavy] correspondence |
| 进行大量的书信往来
|
| 56. | epistolary correspondence |
| 书信往来
|
| 57. | do foreign correspondence |
| 与国外通信
|
| 58. | conduct foreign correspondence in English |
| 用英语与国外通信
|
| 59. | have a large [huge] correspondence to answer |
| 有许多信要回复
|
| 60. | one-way [two-way] correspondence |
| 单方[双方]的通信
|