我父母刚刚经历过：1，离开后续签依然有效 2，海关可能询问出境原因。
续签纸上有一句话，记不得原文，大意是不能靠这个签证多次出入境。所以容易理解为出去即失效。
后来看了学签大小签的说明，才理解了。
续签签证指明居留时间，出入境要看护照上的签证。如果护照上是多次往返签证，那么在续签时间内是可以用那个签证出入境出入境的
我就是看到延期签证上面的这句话理解为再次入境无效的， 不过我反复琢磨CIC官网的那个信息（如下）
When you arrived in Canada and gave your passport to the officer, they authorized your stay by placing a stamp in your passport and/or issuing an additional document. Check your passport. If you find a stamp, it should look like one of these.
For example, if the officer specified a date as shown in the above illustration, your temporary resident status would expire on June 30th, 1993.
If there is no stamp, a handwritten date or document in your passport, your temporary resident status will expire six months from the day you arrived in Canada.
If you were given a visitor record, study or work permit, the expiry date is marked on the document.
“如果在章下签了日子就按照签的日子离境，如果盖了章没签字就有半年的有效期， 如果你有 visitor record, 学签或工签， 你的有效截止日期在这些文件上”....
是不是可以断定的理解为只要有有效的延期签证，入境的时候就算海关只盖章，离境日期遵守这纸上的截止日期就行？ 这样理解对的话就太好了！！
但愿是这样！
