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

 前寒武紀 [ㄑㄧㄢˊ ㄏㄢˊ ㄨˇ ㄐㄧˋ; qian2 han2 wu3 ji4]
 pre-Cambrian, geological period before c. 540m years ago