silurian
柯林斯词典
1. ADJ of, denoting, or formed in the third period of the Palaeozoic era, between the Ordovician and Devonian periods, which lasted for 25 million years, during which fishes first appeared 志留纪的; 奥陶纪与泥盆纪之间，持续了2500万年，此间首次出现鱼类
2. N the Silurian period or rock system 志留纪
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