建立外交关系的英文：
establishment of diplomatic relations

参考例句：

We expected to accelerate trade, the exchange of persons, and eventually diplomacy.
我们期望加速贸易，交流人员，以至最终建立外交关系。

I still think it preferable to put off the establishment of diplomatic relations with the United States for some years
我还是这样看，迟几年跟美国建立外交关系为好。

establishment是什么意思：
n. 建立；设立，创立；机构；公司；会社；学校；机关；企业

Eastern Establishment
东部权势集团

This community was the heart of the American Establishment.
这个集团是美国权势集团的心脏。

The eradication of an established infestation is not easy
根除昆虫蔓延是不容易的。

diplomatic是什么意思：
adj. 外交的，从事外交的；有外交手腕的；圆滑的

The lady is a diplomat.
那位女士是个善于交际的人。

a permanent diplomatic mission
常驻外交使团

Cowperwood was always so diplomatic.
柯帕乌一向是很有外交手腕的。

relations是什么意思：
n. 关系；亲戚（关系）；关联，联系

incidence relation
关联关系

Curious to relate, the giraffe has no voice.
说来奇怪，长颈鹿不会出声。

Of, relating to, or being a real number.
实数的实数的、是实数的或与实数有关的