| 单词 | Gregorian telescope |
| 例句 | But in the Gregorian telescope, the image formed by the principal mirror falls on a second mirror, which is very small, slightly curved, and parallel to the first. Biographies of Distinguished Scientific Men Some recent discoveries in astronomy having arrested his mind, and awakened in him a powerful spirit of curiosity, he sought and obtained from a friend the loan of a two-foot Gregorian telescope. Self help; with illustrations of conduct and perseverance |
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