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From: MDBG CC-CEDICT Chinese-English Dictionary 漢英字典

 下寒武統 [ㄒㄧㄚˋ ㄏㄢˊ ㄨˇ ㄊㄨㄥˇ; xia4 han2 wu3 tong3]
 lower Cambrian series (geological strata from approx 530 million years ago)