小外甥暑期來美，申請的是2月，領館那邊給的是一年多次往返，問題是我們怎樣確定回程票日期；
-"一年多次往返" visa means that you can enter U.S. and go back to China, and then re-enter U.S. again, and so on for several times within one year using the same visa. So, you can book the airticket based on your own travel schedule to come to U.S. and go back to China.
-"一年多次往返" visa means that you can enter U.S. and go back to China, and then re-enter U.S. again, and so on for several times within one year using the same visa. So, you can book the airticket based on your own travel schedule to come to U.S. and go back to China.
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