| 释义 |
Cambrian
['kæm.bri.ən] adjective
■from or referring to the period of geological time between about 543 and 490 million years ago, in which many different types of invertebrate (= without any backbone) animals first appeared 寒武纪的（寒武纪，距今约5.43亿至4.9亿年前的地质时期，无脊椎动物开始大量出现）•The Cambrian era/period寒武纪时期 •Cambrian rocks寒武纪时期的岩石 |