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| 21. | The theory is simple. |
| 原理很简单： |
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| 22. | The domestic and foreign development in photoelectric rotary encoders are mainly introduced, and its working principle, developing history are described briefly as well. |
| 本文主要介绍了光电轴角编码器在国内外的发展现状，并说明了其工作原理及发展历史。 |
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| 23. | principle of electrotechnics |
| 电工原理 |
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| 24. | gravity feed principle |
| 自流进料原理|重力送料原理 |
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| 25. | Principle of Microcomputer |
| 微机原理 |
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| 26. | invariance theory |
| 不变性原理 |
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| 27. | Principle of Mechanic |
| 机械原理 |
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| 28. | an absolute principle |
| 绝对原理 |
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| 29. | box principle |
| 抽屉原理 |
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| 30. | variation principle |
| 变分法原理 |
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