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| 21. | Focus coil |
| 聚焦线圈 |
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| 22. | focus rectifier |
| 聚焦整流器 |
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| 23. | focus inspection |
| 重点视学 |
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| 24. | Newtonian focus |
| 牛顿焦点 |
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| 25. | focus discussion |
| 专题讨论；专题探讨 |
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| 26. | conjugate focus |
| 共轭焦点 |
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| 27. | rectangular focus |
| 矩形焦点 |
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| 28. | focus difference |
| 焦距差 |
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| 29. | Line focus |
| 线焦点 |
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| 30. | focus regulator |
| 聚焦稳压器|聚焦稳压 |
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