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| 31. | The Stone Age; the computer age. |
| 石器时代；电脑时代 |
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| 32. | Space age; space age |
| 太空时代 |
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| 33. | under age;of age. |
| 未成年，未达到法定年龄；成年，达到法定年龄 |
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| 34. | an age bracket; an age group |
| 年龄段 |
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| 35. | This paper dealt with polyacrylamide gel electrophoresis( PAGE) of lactate dehydrogenase( LDH) isoenzymes in fish. |
| 本文对用聚丙烯酰胺凝胶电泳（AGE）离鱼类乳酸脱氢酶（DH）工酶的技术进行了研究。 |
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| 36. | she asked. Her worried frown made her look old and unattractive. |
| 她问这句话时，紧锁眉头，愁容满面，看上去很苍老，很难看。 |
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| 37. | IA (intelligence age); mental age |
| 智力年龄 |
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| 38. | under age; under the age limit |
| 未成年 |
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| 39. | age of reptiles (=reptilian age) |
| 爬行动物时代 |
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| 40. | The Neolithic Age; New Stone Age' |
| 新石器时代 |
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