英语词汇“pre-cambrian era”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	pre-cambrian era
释义	Pre-Cambrian era Pre-Cambrian era all geological time prior to the beginning of the CAMBRIAN PERIOD 590 million years ago. Very few fossils are known from this time and the fossil record effectively begins with the trilobites and brachiopods of the Cambrian. However, impressions of soft-bodied animals such as medusae, sea pens, annelids and some arthropods have been found in Pre-Cambrian rocks dated between 640 and 580 million years old. Bacteria may have existed for up to 3,800 million years and blue-green algae (CYANOBACTERIA) for 3,500 million years.
随便看	evaluating printed education materials evaluating programs of innovative continuing care evaluating software development tools evaluation evaluation & acceptance test evaluation agent evaluation analysis center evaluation and analysis reports system evaluation and brief ptsd evaluation and brief treatment ptsd evaluation and brief treatment ptsd (post-traumatic stress disorder) unit evaluation and data collection plan evaluation and demonstration of innovative city transport evaluation and feedback evaluation and impact assessment evaluation and management evaluation and management codes evaluation and oversight unit evaluation and policy analysis unit evaluation and quality improvement program evaluation and quality in library performance system for europe evaluation and repair tools working group evaluation and report language evaluation and review of nice evaluation and standardization management information system

英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。

Pre-Cambrian era

Pre-Cambrian era