| 单词 | nacreous clouds |
| 释义 | nacreous clouds [`nā·krē·ǝs `klau̇dz] METEOROLOGY Clouds of unknown composition, whose form resembles that of cirrus or altocumulus lenticularis, and which show very strong irisation similar to that of mother-of-pearl, especially when the sun is several degrees below the horizon; they occur at heights of about 12 or 18 miles (20 or 30 kilometers). Also known as mother-of-pearl clouds. |
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