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| 81. | Americans are heterogeneous in their origins, constantly striving to rediscover what they have in common |
| 美国人的祖先来自各个方面，他们经常努力设法重新找出大家的共同点。 |
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| 82. | A gunner who is not scanning constantly is not doing his job. |
| 搜索敌人，一个不经常搜索周围的炮手是不称职的。 |
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| 83. | A scientist constantly tried to defeat his hypotheses, his theories, and his conclusion. |
| 科学家经常设法否定自己的假设，推翻自己的理论，并放弃自己的结论。 |
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| 84. | if not, we will constantly live in fear and that is worse than death itself. |
| 要不然，我们将经常活在恐惧之中，这将比死亡本身更糟糕。 |
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| 85. | These models must be constantly revised as new data is added from many observations. |
| 这些模式必须随来自很多观测站新数据的增加经常进行校订。 |
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| 86. | Existing knowledge was the storehouse of the past; it had to be thoroughly explored and constantly extended |
| 现有的知识只是过去的仓库，必须彻底探究并且经常扩充。 |
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| 87. | Mobilize citizens to constantly participate in one or two sports activities that fit their own physical |
| 动员市民经常参加1至2项适合自身特点的体育活动。 |
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| 88. | " They have elevators in public housing, and they're constantly getting out of fix, " she said. |
| 她说：“他们在公房里装有电梯，可这些电梯经常出毛 |
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| 89. | For example," I am never satisfied with my medical knowledge, so I am constantly reading. |
| 例如：“我总是不满足于自己现有的医学知识，所以我经常看书。 |
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| 90. | Our base areas are constantly expanding and contracting, and often as one base area falls another rises |
| 时大时小时缩时伸是经常的，此起彼落也往往发生。 |
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