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| 21. | refracting telescope |
| 折射望远镜 |
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| 22. | refractor, was vastly improved when it became possible to manufacture high-quality lenses made from flint glass |
| 透镜望远镜，或称折射望远镜，在人们能够制造出高质量的火石玻璃透镜以后得到了很大的改进。 |
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| 23. | the moons of Jupiter were produced by Galileo's spy-glass, |
| 把伽利略观察到的木星卫星说成是伽利略用他的小望远镜变出来的人们， |
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| 24. | telescope holder |
| 望远镜支架 |
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| 25. | Without communicating his thoughts to his companion, he sat down, drew out his opera-glass, and looked |
| 他不露声色地坐下，拿出他的望远镜，向别处观望。 |
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| 26. | a small telescope attached to a large telescope to use in setting the line of the larger one. |
| 装在大望远镜上的小望远镜。 |
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| 27. | face of theodolite |
| 经纬仪望远镜位置;经纬仪望远镜位置 |
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| 28. | tracking telescope |
| 跟踪望远镜 |
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| 29. | Someone get me a glass! |
| 给我副望远镜！ |
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| 30. | telescope level |
| 望远镜水准器 |
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