1·The three men smiled and quickly responded in unison, “We have to go to the toilet.”
三个人笑了笑,然后很快的齐声答道:“我们必须去厕所。”
2·Walking, the staff will help you in the things you buy, send you to the door, in unison to say thank you.
走的时候,店员会帮您拿着您买的东东,送您到门口,齐声的说谢了。
3·I don't, "they answered in unison."
“我不,”他们齐声答道。