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 志畱紀的; 奧陶紀與泥盆紀之間，持續了2500萬年，此間首次出現魚類
2. N the Silurian period or rock system 志畱紀
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