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

 顯生宙 [ㄒㄧㄢˇ ㄕㄥ ㄓㄡˋ; xian3 sheng1 zhou4]
 Phanerozoic, geological eon lasting since the Cambrian 武紀, c. 540m year ago