| 41. | The dog learned to know his voice. |
| 那只狗学会了识别他的声音。
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| 42. | He has written down many of the things he has learned from them in scientific papers. |
| 他把从他们那里学到的很多东西写进了他的科学论文。
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| 43. | Galapagos hawks have never learned the fear of man. |
| 加拉帕戈斯群岛的鹰从来不知道怕人。
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| 44. | The re is no magic formula which, once learned , can thereafter be applied to every situation. |
| 那种一旦学会日后便可以到处套用的妙方根本不存在。
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| 45. | He had never learned to dance and was not prepared to make a fool of himself. |
| 他从没学过跳舞，不想出洋相。
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| 46. | As a result, humans have learned to respect feline independence. |
| 结果是人们已经学会尊重猫的独立性。
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| 47. | There are countless people who, ever since their early years, have learned to associate snails with food. |
| 有不计其数的人们从小就知道蜗牛可做菜。但我的朋友罗伯特却住在一个厌恶蜗牛的国家中。
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| 48. | We can read of things that happened 5,000 years ago in the Near East, where people first learned to write. |
| 我们从书籍中可读到5,000 年前近东发生的事情，那里的人最早学会了写字。
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| 49. | Alfred had learned many of their ballads in his youth, and could vary his programme with acrobatic tricks and simple conjuring. |
| 阿尔弗德年轻时学过许多民歌，并能穿插演一些杂技和小魔术使自己的节目多样化。
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| 50. | In this way, we have learned all that we know of the laws of astronomy, or of the habits of the social insects, let us say. |
| 例如，用这种方法，我们完全掌握了天文学的规律和昆虫群居的习性。
|