1. And they can travel now and pay later by using their credit cards.
    他们可以先旅行然后再用信用卡付帐。

2. At times the heat was so fierce they could only travel at night, resting during the day in hammocks slung between trees.
    有时候，炎热是如此的酷烈，以致于他们只能在夜间行走，白天在两棵树之间悬挂的吊床上休息。

3. You never have to travel miles to see your friends.
    你去看朋友根本不用跋涉好几英里，

4. She is tourist guide of a travel bureau.
    她是一家旅游社的导游。

5. Some cities have subways,and airplanes travel all over the country.
    有些城市有地下火车道, 还有飞机航行全国各地.

6. Soon the hobby leads to travel, perhaps to a meeting in another town, possibly a trip abroad in search of a rare specimen,
    用不了多久，有这种爱好的人便开始旅行，也许是去另一个城市参加会议，也可能是出国寻找一件珍品，

7. People had to travel by horse or camel or on foot.
    人们不得不靠着骑马、骑骆驼或步行去旅行。

8. More recently, automobiles and planes have made travel both faster and more convenient.
    在最近些时候，汽车和飞机使旅行变得既快又方便。

9. Because the dust becomes thinner the further we travel towards the outer edges of our own solar system.
    因为我们越是接近太阳系的边缘，尘埃就越稀薄。

10. Radio waves also travel at the speed of light,
    无线电波也是以光速传播的。