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。
On behalf of the Beijing Municipal government, i wish to express our heartfelt thanks to you for your gracious assistance.