emissary
noun [ C ] formal uk/ˈem.ɪ.sər.i/ us/ˈem.ɪ.ser.i/
使者;特使;密使
a person sent by one government or political leader to another to take messages or to take part in discussions
He flew to China as the personal emissary of the President. 他以总统的私人特使身份乘飞机前往中国。
Synonym: envoy