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单词 Unkar
释义

Unkar

adjective

Un·​kar
ˈəŋˌkär
: of, relating to, or constituting the lower division of the Algonkian rocks in the Grand Canyon region, Arizona, consisting mainly of sandstone with some limestone and conglomerate and forming a layer nearly 7000 feet in thickness

Word History

Etymology

from the Unkar valley, Arizona

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更新时间:2024/12/23 21:45:41