She went to Guilin on a special mission.

她专差去桂林。

《新英汉大辞典》

He went to Japan on a special mission.

他去日本负有特殊使命。

youdao

He was even sent to Korea on a special mission.

他甚至还被派遣到韩国去执行任务。

youdao

At long last, having joined the Special Air Service in 1944, he got the chance to go on a special mission, if still not a secret one.

ECONOMIST: M.R.D. Foot

British special forces are on standby to stage a rescue mission in Algeria, after foreign gas plant workers were taken hostage, says the Times.

BBC: Papers

Thanks to the Center of Studies for Peace and the Development, and with the support of the UNESCO Office in Jakarta, young women and men will be at the heart of attention in Timor-Leste on 26 February 2013, during a National Consultation in direct continuity with the special mission of the United Nations in this country, which has just ended.

UNESCO: THEMES