Proterozoic

[,prɑtərə'zoɪk]

解释:

(noun.) from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms.

(adj.) formed in the later of two divisions of the Precambrian era; 'proterozoic life forms' .

欧文整理--From WordNet

例句:

校对:奥斯瓦德

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