好久不见了！
Long time no see.
辛苦了！
You've had a long '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.
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