We travel back and forth all the time between Canada and England.

我们总是在加拿大和英格兰两地来回旅行。

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But when it comes to business data, the need to travel back and forth in time is absolutely essential.

但是当涉及到业务数据，穿越时间旅行的能力非常重要。

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You will experience living in the continuum, where all lifetimes are happening simultaneously, and you will travel back and forth between Earth and worlds with compatible energy levels.

你们将体验到生活在连续体中，这里所有的人世经历都在同时发生着，你们可以往回或往前，在与地球能量兼容的能量层次。

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Representatives from the various aid groups constantly travel back and forth to the camp, and foreign delegations often visit.

WSJ: Bomb Strikes Pakistani Refugee Camp

Georgia and Turkey recently agreed to open their borders, allowing citizens and cars from both countries to travel back and forth freely.

NPR: Adventures Along the Caspian Pipeline

When his colleagues sought to avoid the stress of long flights and time away from home, the lawyer volunteered to travel back and forth.

FORBES: Magazine Article