zhòu sī dùn
Zeus's shield
Aegis combat system (US missile guidance)
Tài gǔ zhòu
Archaean (geological eon before 2500m years ago)
Yuán gǔ zhòu
pre-Cambrian (geological eon 2500-645m)
Xiǎn shēng zhòu
Phanerozoic, geological eon lasting since the Cambrian 寒武紀|寒武纪[Han2 wu3 ji4], c. 540m year ago
Yǔ zhòu hào
Cosmos, Russian spacecraft series
yǐn shēng zhòu
Cryptozoic
geological eon before the appearance of abundant fossils
hidden life, as opposed to Phanerozoic
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