Traitor and converter
Son: "Father, what is a traitor?
Father: "A traitor is a man who leaves our party and goes over to the other one."
Son: "Well then, what is a man who leaves his party and comes over to yours?"
Father: "A converter, my son."
　

叛徒和投诚者

“爸爸，什么是叛徒？”
“叛徒就是一个离开我们政党加入别的党的人。”
“那要是有人离开他的政党加入我们党呢。”
“那他就是一个投诚者，孩子。”