Silurian
柯林斯詞典
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(xù)了2500萬年，此間首次出現(xiàn)魚類
2. N the Silurian period or rock system 志畱紀
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Silurian /sa??l??r??n/
劍橋詞典
- 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
志畱紀的（迄今約4億4500萬至4億2000萬年前的地質(zhì)時間段，此時期有頜骨的魚類以及陸地上的植物和小型動物第一次出現(xiàn)）
the Silurian period 志畱紀
Silurian rocks 志畱紀巖石
the Silurian
noun [ 單數(shù)名詞 ]the Silurian period
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