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(jì)，似蠕蟲生物逐漸演化成似魚生物。
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(jì)時(shí)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.
二疊紀(jì)全球性大規(guī)?；鹕交顒?dòng)，致使區(qū)內(nèi)整個(gè)中寒武紀(jì)的火山沉積巖普遍發(fā)生變質(zhì)。