There is a sign, and it reads:"Warmly Welcome Mr. Kofi Annan, Secretary General of the United Nations, to Zhejiang University"
Our foreign teacher said it should be "Zhejiang University warmly welcomes Mr. Kofi Annan, ..."
But I looked up this word "welcome" in Merriam-Webster dictionary (an electronic one), and I found this example:"She welcomed the students into her home." and the example "We welcome you to the show."
I think the structures of these sentences are the same: welcome SB. to SP.
Why is the sentence I mentioned in the title wrong? Thanks!