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以上来源于: WordNet
N a typically thin band of sediment deposited annually in glacial lakes, consisting of a light layer and a dark layer deposited at different seasons 纹泥 [geology]
Tree rings and seasonal sedimentary deposits called varves can be counted to determine absolute age.
树木的年轮和季节性沉积被称为年变层,可计算用于确定绝对年龄。
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