| 31. | It was upon this principle that the first instruments were made, but while the drum was being shaken, the line that the pen was drawing wriggled from side to side. |
| 只要一切都是静止的，笔就会划出一条直线；但是，圆筒受到震动，笔所画出的线就会就会左右摆动。
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| 32. | This echo-location in bats is often compared with radar, the principle of which is similar. |
| 蝙蝠这种回声定位常常可与雷达相比较，其原理是相似的。
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| 33. | Politicians agree, in principle , so America and the EU have been trying to reach a deal which would eliminate the need to double-test many products. |
| 政治家在原则上同意了， 因此，美国和欧洲一直在寻求达成协议，以便为许多产品取消双重检查。
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| 34. | Such extreme cases must probably be taken with a grain of salt, but they do underline the general principle that the relationship between elephant and mahout is the key to successful training. |
| 这种极端的事例虽不可全信，但强调了一项基本原则，象和驯象员之间的关系是驯象成功与否的关健。
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| 35. | A principle contribution to this work has been the partitioning of intelligence into component abilities. |
| 对这项工作作出重大贡献的是把智力划分成各种组合能力。
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| 36. | However, the world is so made that elegant systems are in principle unable to deal with some of the world's more fascination and delightful aspects. |
| 然而，世界就是如此。一般而言，完美的体系无法解决世界上某些更加引人入胜的课题。
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| 37. | The principle had been pernicious from beginning to end. |
| 这条原则自始至终都是有害的。
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| 38. | The principle at bottom is the same. |
| 这原则实际上没有变。
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| 39. | They accepted the plan in principle . |
| 他们原则上同意这项计划。
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| 40. | The airship is constructed on the principle of reducing it to a minimum of weight consistent with the strength. |
| 飞艇是根据在不影响牢度的前提下尽量减少其重量的原则建造的。
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