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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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