我妹妹在美国，持工签，上个月申请了一个单次往返加拿大的旅游签证，已经返回美国，她想下个月再来加拿大，还需要再重新申请签证吗？谢谢！
上CIC的网站上看有这么一段：
Do I need a multiple entry Temporary Resident Visa if I intend to travel to the United States during my visit to Canada?
A single entry visa allows you to enter Canada only once. However, this visa may also be used for repeated entries into Canada from the USA or St. Pierre and Miquelon provided you do not enter any other country. Such entries must occur within the time that was granted for your stay in Canada.
If you intend to travel to the United States during your visit to Canada, you do not need a multiple-entry visa in order to re-enter Canada directly from the United States during the authorized duration of your stay in Canada.
但是专家解读说这是基于你主要呆在加拿大，去趟美国，还能再用单次签证回加拿大，如果主要呆在美国，单次签证就只能用一次，我现在都糊涂了，请教各位
上CIC的网站上看有这么一段：
Do I need a multiple entry Temporary Resident Visa if I intend to travel to the United States during my visit to Canada?
A single entry visa allows you to enter Canada only once. However, this visa may also be used for repeated entries into Canada from the USA or St. Pierre and Miquelon provided you do not enter any other country. Such entries must occur within the time that was granted for your stay in Canada.
If you intend to travel to the United States during your visit to Canada, you do not need a multiple-entry visa in order to re-enter Canada directly from the United States during the authorized duration of your stay in Canada.
但是专家解读说这是基于你主要呆在加拿大，去趟美国，还能再用单次签证回加拿大，如果主要呆在美国，单次签证就只能用一次，我现在都糊涂了，请教各位
