1. He said that someone might be spying on the station and the pilot was ordered to keep track of the strange object.
    他说可能有人正对基地进行侦察，因此命令那个飞行员跟踪那个奇怪的飞行物。

2. He runs round the track or plays ball games.
    他或者沿跑道跑跑步或者打打球。

3. Don´t draw a red herring across the track.
    不要转移别人对主要问题的注意力。

4. Do you want a single or a return ticket?
    你要单程票还是往返票?

5. And if a single curved glass would distort nature, how much more would a pair of them?
    何况一片曲面镜就可歪曲自然，那么伽利略的两片曲面镜对自然的歪曲又该多大呢？

6. During a single crucial three-week period during our teenage years, chemical activity in the brain is cut in half.
    我们的青少年阶段有一个为期三周的关键时期，此时脑部的化学反应活动一分为二。

7. A single spark can start a prairie fire.
    星星之火, 可以燎原。

8. As we bumped over the dusty track, we swerved to avoid large boulders:
    我们在尘士飞扬的道路上颠簸，车子东拐西弯，以躲开那些大圆石。

9. As a single man he had never troubled much if he happened to be out of work; but now that he was married it was different: the fear of being "out" haunted him all the time.
    他过单身生活时，即使偶尔失了业，他也未太烦恼过。可是，既然结了婚，情况就不同了，失业的恐惧时刻都在困扰着他。

10. As we drove along, someone would single out to me a famous building, an important street, a park, a bridge that when built was thought to be a landmark.
    当我们驱车行驶的时候，有人指给我看那些建造时被曾认为是陆上的标志性建筑物：著名大楼、重要街道，公园和大桥。