xiǎn shēng dài
Phanerozoic, geological eon lasting since the Cambrian 寒武紀|寒武纪[Han2 wu3 ji4], c. 540m year ago
显
xiǎn
to make visible
生
shēng
to be born
代
dài
to be a substitute for; to act on behalf of; to replace; to substitute
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