| 41. | Faith that he was on the right track supported him through all his research. |
| 他相信自己的路子对头，这一信念支持着他完成全部研究工作。
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| 42. | 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。
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| 43. | 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。
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| 44. | If I placed a safety pin on a steel railroad track and let a train run over it, the safety pin would turn into a pair of bright brandnew scissors. |
| 如果把一枚别针放在铁路钢轨上，让火车从上面压过，别针就会变成一把闪光发亮的新剪刀。
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| 45. | Signals control each section of the railway track . |
| 各种信号控制着铁路轨道的每个部分。
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| 46. | Donkeys bore supplies up the steep mountain track . |
| 驴子驮着生活必需品走上陡峭的山路．。
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| 47. | It is his duty to switch cars from one track to another. |
| 他的职责是扳道。
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| 48. | a bumpy road, track , etc |
| 不平的路面， 跑道等
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| 49. | track suit bottoms |
| 运动裤
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| 50. | lay down a new ship, railway track |
| 建造新船, 新铁路
|