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1·Usually, as they swim, they make clicking noises, and the resulting sound waves are reflected in an echo and travel back to them.

通常，当它们游泳时，会发出咔嚓的声音，所产生的声波会在回声中被反射回到它们身边。

2·It also avoided a lot of travel back and forward.

这也避免了很多旅行的前进和后退。

3·Tips for those who wish to travel back to history

给那些希望穿越历史的人的小贴士

4·If you could travel back in time, what would be your destination?

如果可以穿越时间，你的目的地会选哪儿？

5·Many of them travel back home and meet friends over dinner and drinks.

许多人在春季期间都要回老家过年，跟朋友碰碰头，聚个餐。

6·Travel back in time in Istanbul, the only city to straddle two continents.

在唯一一座横跨两个大陆的城市伊斯坦布尔旅行时，你会产生穿梭时空之感。

7·Here are six ways to travel back in time without setting foot in a time machine.

以下有六种不用时光机就能及时回到过去的方法。

8·Travel back to the spring of 1997, a land of rap-rock and Bridges to the 21st century.

让我们追溯到1997年的春天，桥接21世纪的说唱摇滚大本营。

9·Some of this light would then travel back to the door and be reflected into the camera.

其中一些光会向门这个方向反射回来并又被反射回相机中。

10·I received it the night before Heather and I were to travel back to Paris and then home.

就在我快结束旅途，回到巴黎，准备和女儿海瑟回美国的前一天晚上，我收到了这份传真。