The program allows certain foreign nationals to transit a participating Canadian international airport, on their way to and from the United States, without a Canadian transit visa if they meet these requirements:
They are from certain countries;
They hold a valid U.S. visa; and
They travel on an approved airline.
回上一页，这个有写。你只要有有效机票和签证。可以在加拿大转机不需签证。
追问Certain countries 不是指特定国家吗？包括中国吗？谢谢！
追答不包括中国。