xiaobaitu 及各位, 再请看:

下面是同一预约网站上的一条FAQ
What will happen if my visa is denied?

In the event that applicants residing in the U.S. applies for their visas in Canada or Mexico and are denied, they should be prepared to leave Canada or Mexico without a U.S. visa. They should return to their country of permanent residence and apply for the visa in that country. Landed Immigrants, Temporary Workers and Students in Canada may reapply at the same U.S. Consulate the visa denial occurred when they are in possession of compelling evidence to overcome the first denial. However, a new application without additional material or any new circumstances is likely to result in another finding of ineligibility.