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| 21. | The theory is simple. |
| 原理很简单： |
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| 22. | box principle |
| 抽屉原理 |
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| 23. | gravity feed principle |
| 自流进料原理|重力送料原理 |
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| 24. | principle of electrotechnics |
| 电工原理 |
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| 25. | Typically, this principle employs the geometrical relations between various displacements in order to solve problems of statics. |
| 为了解静力学问题，这个原理典型地使用了各种位移回的几何关系。 |
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| 26. | Principle of Microcomputer |
| 微机原理 |
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| 27. | invariance theory |
| 不变性原理 |
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| 28. | comparative principle of satisfying needs |
| 满足需要比较原理;满足需要可比原理 |
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| 29. | an absolute principle |
| 绝对原理 |
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| 30. | Principle of Mechanic |
| 机械原理 |
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