通过外交途径进行谈判的英文：
to negotiate through diplomatic channels

negotiate是什么意思：
v. 商议，谈判；谈妥，转让；超越

They negotiated a treaty.
他们商订了一项条约。

The contract was negotiated.
合约已谈妥。

It does not operate as a negotiation of the bill.
它不能作为汇票流通转让。

through是什么意思：
prep. 通过，穿过，凭借，由于，从始至终，遍及，完成、耗尽，不顾，贯穿
adv. 直达，从头至尾，电话接通
adj. 直达的，完成的、结束的，电话接通的

Have you got through?
电话接通了吗？

To foretell through or as if through the art of divination.
占卜，预言通过或似通过占卜术预言

Lasting or active through the year or through many years.
常绿的全年或多年都充满生机

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。