in·ter·loc·u·tor
noun/ˌɪntəˈlɒkjətə(r)/
/ˌɪntərˈlɑːkjətər/
(formal)- a person taking part in a conversation with you
参加谈话者；对话者 - a person or an organization that talks to another person or organization when acting for somebody else
（代表他人的）中间对话者
Word Originearly 16th cent.: modern Latin, from Latin interlocut- ‘interrupted (by speech)’, from the verb interloqui, from inter- ‘between’ + loqui ‘speak’.