英语小组对话双人怎么说

In English, a conversation between two people in a group is often referred to as a "two-person conversation" or a "duo conversation." You could also say "a conversation between two people" or "a conversation between a pair of people."
For example:
"We had a two-person conversation about our plans for the weekend."
"I had a duo conversation with my partner about the project we're working on."
"I overheard a conversation between two people discussing their travel plans."
"I joined a conversation between a pair of coworkers about the new office policies."