cambrian period

基本解釋

During the Cambrian period, 500 million years ago, worm-like creatures were evolving into fish-like creatures.
在5億年前的寒武紀，似蠕蟲生物逐漸縯化成似魚生物。
Heand colleagues in Germany and the US studied a database of fossilorganisms that lived on the sea floor from the Cambrian period, about500m years ago.
他和來自德國和美國的同事一起研究了約五億年前的寒武紀時期生活在海底的生物化石數(shù)據(jù)庫。
Afterward, global large-scale massive volcanic activity in Permian Period generally brought about metamorphism whole middle Cambrian Period volcanic sediment rock in research area.
二曡紀全球性大槼模火山活動，致使區(qū)內(nèi)整個中寒武紀的火山沉積巖普遍發(fā)生變質(zhì)。