寒武纪大爆发 hánwǔjìdàbàofā Cambrian explosion Definitions Defs Origin Strokes Stroke Words Sentences Sents 寒武纪大爆发 寒武紀大爆發 hánwǔjìdàbàofā Cambrian explosion the sudden appearance in the fossil record of most major animal body plans approximately 541 million years ago
寒武纪大爆发 寒武紀大爆發 hánwǔjìdàbàofā Cambrian explosion the sudden appearance in the fossil record of most major animal body plans approximately 541 million years ago
