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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Silurian /saɪˈlʊərɪən/
剑桥词典
- from or referring to the period of time between about 445 and 420 million years ago, in which fish with jaws (= mouth bones ) and some plants and small animals on land first appeared
志留纪的（迄今约4亿4500万至4亿2000万年前的地质时间段，此时期有颌骨的鱼类以及陆地上的植物和小型动物第一次出现）
the Silurian period 志留纪
Silurian rocks 志留纪岩石
the Silurian
noun [ 单数名词 ]the Silurian period
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