After his election defeat he was reassigned to the diplomatic service.

落选之后，他又被派到外交部门工作。

《牛津词典》

He attained a high grade in the diplomatic service.

他在外交界的地位很高。

youdao

After further studies in Beijing, he joined the Chinese legation in St Petersburg as a translator, before eventually entering the diplomatic service in his own right.

在北京深造后，他成为中国驻圣彼得堡公使馆的一名译员，这是在他最终凭自己的能力进入外交界之前。

youdao

Lady Ethel married Sir Francis Stronge who joined the diplomatic service in London in 1879 and served in Peking the same year.

BBC: The Chinese vase

Many in the audience might have thought Zhu had honed his language skills and extensive knowledge of finance through years of work abroad, possibly in the diplomatic service.

CNN: THE MAN WITH THE IRON FACE

The profession most dominated by Oxford and Cambridge graduates was the diplomatic service at 62%, followed by the law at 58% and the top echelons of the civil service at 55%.

BBC: Oxbridge dominates list of leading UK people