"Welcome back" is a phrase commonly used to greet someone who has returned after being away. It is a popte and friendly way of acknowledging the person's return.
Example sentence in Engpsh:
"Welcome back, how was your vacation?"
"It's good to see you again, welcome back."
中文翻译：
"欢迎回来，假期怎么样？"
"很高兴再见到你，欢迎回来。"