31. | People used to build strong walls round their towns as a defense against enemies. |
| 从前人们常在城池四周修筑坚固的城墙以防御敌人。
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32. | build [construct, erect] a dam across the river. |
| 在河上筑坝。
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33. | The design showed how to build the machine. |
| 设计图说明了如何制造这台机器。
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34. | The patient must build himself up with a nourishing diet. |
| 这位病人必须加强营养以增强体质。
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35. | They are mostly short and slight in build . |
| 他们大多数身材矮小。
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36. | They collected driftwood to build a beach shelter. |
| 他们收集漂浮的木头在海边搭了一个栖身之处。
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37. | He was stout of build . |
| 他身材矮胖。
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38. | Take part in the physical exercises and build up [develop] your strength. |
| 参加体育活动,增强你的体力。
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39. | Promote physical culture and build up the people's health. |
| 发展体育运动,增强人民体质。
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40. | It has done so much to build up the honor and prosperity of the firm. |
| 它为树立该公司的信誉和开创其繁荣局面发挥了很大作用。
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