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| 21. | The theory is simple. |
| 原理很简单： |
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| 22. | Principle of Microcomputer |
| 微机原理 |
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| 23. | principle of electrotechnics |
| 电工原理 |
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| 24. | Principle of Mechanic |
| 机械原理 |
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| 25. | In this paper the principle and method of testing of RMS(Root Mean Square )graininess of radiograph were described. |
| 作者介绍了X线照片均方根值（rootmeansquare，RMS）粒状度的测试原理及方法。 |
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| 26. | variation principle |
| 变分法原理 |
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| 27. | an absolute principle |
| 绝对原理 |
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| 28. | box principle |
| 抽屉原理 |
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| 29. | invariance theory |
| 不变性原理 |
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| 30. | transfer principle |
| 传递原理 |
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