| 单词 | circumhorizontal arc |
| 释义 | circumhorizontal arc [¦sǝr·kǝm´här·ǝ`zänt·ǝl `ärk] OPTICS A halo phenomenon consisting of a colored arc, red on its upper margin; it extends for about 90° parallel to the horizon and lies about 46° below the sun. |
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