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| 51. | natural epidemic focus |
| 自然疫源地 |
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| 52. | variable-focus pyrometer |
| 变焦点高温计 |
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| 53. | vidicon focus coi |
| 摄像管聚焦线圈 |
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| 54. | electrostatic-focus gun |
| 静电聚焦电子枪 |
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| 55. | Effective focus size |
| 有效焦点尺寸 |
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| 56. | United Nations Focus |
| 联合国专讯 |
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| 57. | Axial offset-focus |
| 轴向偏焦 |
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| 58. | dynamic focus circuit |
| 动态聚焦电路 |
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| 59. | Lateral offset-focus |
| 横向偏焦 |
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| 60. | fixed focus pyrometer |
| 固定焦距高温计 |
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