好久不见了！　Long time no see.

　　辛苦了！　You've had a long day.You've had a long flight.

　　尊敬的朋友们！　Distinguished/Honorable/Respected friends

　　阁下(多用于称呼大使)　Your Excellency

　　热烈欢迎各位朋友访问西安。 I wish to extend our warm welcome to the friends who have come to visit xi,an.

　　在西安过得怎么样？　How are you making out in xi,an?

　　我一定向他转达您的问候和邀请。　I'll surely remember you and your invitation to him.

　　欢迎多提宝贵意见。　Your valuable advice is most welcome.

　　不虚此行!　It's a rewarding trip!.

　　请代我问候王先生。　Please remember me to Mr.Wang.

　　请留步，不用送了！　I will see myself out, please.

　　多保重！　Take care!

　　祝您一路平安！　Have a nice trip!