proterozoic

柯林斯词典

Proterozoic /ˌprəʊtərəʊˈzəʊɪk/

• 1. N the later of two divisions of the Precambrian era, during which the earliest plants and animals are assumed to have lived 原生代→compareArchaeozoic

• 2. ADJ of or formed in the late Precambrian era 原生代的

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