| 51. | The aircraft was able to fly over the endless white plains without difficulty. |
| 飞机可以毫无困难地飞过这片茫茫无际的白色原野！
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| 52. | The officer in the control tower was very angry when he heard the news, because balloons can be a great danger to aircraft . |
| 控制塔上的官员得知这一消息后，非常气愤，因为气球有可能给飞机造成极大的危险。
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| 53. | Some time ago the United States Navy, for instance, examined a very large number of men working on aircraft carriers: the study was known as Project Anehin. |
| 例如，美国海军前些时候调查了许多在航空母航上工作的人，这次调查被称之为：“安内英工程”。
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| 54. | if you think what it must be like to share the deck of a ship with several squadrons of jet aircraft , you will realize that a modern navy is a good place to study noise. |
| 因此，如果你能想像出和几个中队的喷气机同在一个甲板上是什么滋味儿的话，你就会认识到现代海军是研究噪音的好地方。
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| 55. | Ever since, people have had difficulty in deciding whether the craft should be ranged among ships, planes, or land vehicles -- for it is something in between a boat and an aircraft . |
| 自那以后，人们很难决定是否应该将这种运载工具列为轮船、飞机，或是陆上交通工具，因为它是介于船和飞机之间。
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| 56. | like bird-watching, aircraft spotting has become a national pastime. |
| 观察飞机就象观鸟一样已成为一项全国性的活动。
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| 57. | The aircraft was flying above thick fog. |
| 飞机在浓雾上空飞行。
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| 58. | The new aircraft is undergoing safety tests. |
| 这种新飞机正在接受安全性能检验。
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| 59. | The aircraft behaved well on its first test flight. |
| 这架飞机初次试飞时性能良好。
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| 60. | Several aircraft were intercepted and brought down. |
| 有几架飞机遭到拦截，被击落了。
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