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| 21. | Lasers can also be used to purify materials. |
| 激光还可以用于材料提纯。 |
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| 22. | Water power can be used to generate electricity. |
| 水力可以用来发电。 |
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| 23. | But ignorance cannot be used to rationalize irresponsibility. |
| 但是不知情不能成为不负责任的理由。 |
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| -- 来源 -- 现代英语佳作赏析 未来篇 - On AIDS and Moral Duty |
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| 24. | The effects can be used to advantage, too. |
| 但是乘飞机旅行对身体的影响也可使之对人有利。 |
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| 25. | This can be used to extend visual range. |
| 可以用来延伸视野。 |
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| 26. | The coal can be used to produce electricity. |
| 煤可用来发电。 |
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| 27. | Lasers can be used to perform operations nowadays. |
| 现在激光可以用来做手术。 |
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| 28. | The knife can be used to cut meat. |
| 刀能用来切肉。 |
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| 29. | What method should be used to include it? |
| 采用什么样的方法来包含这些内容？ |
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| 30. | Computer methods may then be used to advantage. |
| 采用计算机方法是有益的。 |
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