Ordovician

劍橋詞典

from or referring to the period of time between about 485 and 445 million years ago, in which there were many different types of animals in the sea , including vertebrates (= animals with back bones ), but no life on land
奧陶紀的（距今約4億8千5百萬年至4億4千5百萬年前間，此時水中已有許多動物包括脊椎動物，但是陸地上還沒有動物）
the Ordovician period 奧陶紀
Ordovician fish 奧陶紀的魚類

the Ordovician

noun [ 單數(shù)名詞 ]

the Ordovician period
奧陶紀 返回 Ordovician