我们要求学生至少提前4周提供完整的航班信息。
We require the student's full flight details at least 4 weeks in advance.
如果你能在周二或周三坐飞机，并且至少提前21天购票，我建议你预订往返短途航班。
If you can fly on a Tuesday or Wednesday, and buy your tickets at least 21 days in advance, I suggest you book a round trip excursion flight.
如果你能在周二或周三坐飞机，并且能至少提前21天购票，我建议你预订往返短途航班。
If you can fly on a Tuesday or Wednesday, and buy your tickets at least 21 days in advance, I suggest you book a round-trip excursion flight.
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