我们总是在加拿大和英格兰两地来回旅行。
We travel back and forth all the time between Canada and England.
有些十几岁的孩子不得不在父母双方之间来回旅行，这不论对社会还是在实际操作的层面上都是一个挑战。
Some teens have to travel between parents, and that can create challenges both socially and practically.
旅行和交流的便利，再加上更宽松的国界，使得游者、员工、流浪旅行者和无国籍漂流者络绎不绝的来回穿梭。
The ease of travel and communication, combined with the looser borders, gives rise to endless crisscrossing streams of wanderers and guest workers, nomadic adventurers and international drifters.
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