久仰！I ve heard so much about you.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我代表北京市政府欢迎各位朋友访问北京。On behalf of the Beijing Municipal government, I wish to extend our warm welcome to the friends who have come to visit Beijing.对您的大力协助，我谨代表北京市政府表示衷心的感谢。