他们在互相告别用英文怎么说他们在互相告别 用英文怎么说快和老师说再见呢？
问题描述：
他们在互相告别用英文怎么说
他们在互相告别 用英文怎么说
快
和老师说再见呢？
答
They are saying goodbye to each other.
答
they are saying farewell to each other
答
they are saying goodbye to each other
更正式书面一点：
They are bidding each other farewell.