单词 | blue band |
释义 | blue band [¦blü `band] ASTRONOMY A dark band which appears around the polar caps of Mars as they shrink during the spring and early summer. GEOLOGY 1. A layer of bubble-free, dense ice found in a glacier. 2. A bluish clay found as a thin, persistent bed near the base of No. 6 coal everywhere in the Illinois-Indiana coal basin. |
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