cretaceous
cretaceous 英 [krɪ'teɪʃəs] 美 [krɪ'teʃəs]
adj. 白垩纪的；似白垩的 n. 白垩纪；白垩系
名词复数:cretaceouss
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- adj. 白垩纪的；似白垩的
- n. 白垩纪；白垩系
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1. Only, there are no spoonbill fossils from the early cretaceous, so there is no way to say for sure.
只是没有发现来自白垩纪早期的篦鹭化石，所以没法肯定这一说法。
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2. South America in the Early cretaceous was the stage for the ultimate hunt: the largest predator ever, stalking the largest prey of all time.
在早期白垩纪的南美洲完全就是一个捕猎场：数量最多的猎食者捕食体积最大的猎物的场景反复上演。
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3. In his view, the hosts on which lice were speciating during the cretaceous could have been a different branch of the mammalian family tree, all of whose species are extinct.
在他看来，在白垩纪虱子物种进化时的宿主可能是哺乳动物系统树上的另一分支而这一分支上的所有物种都灭绝了。
- cretaceous (adj.) 1670s, "chalky," from Latin cretaceus "chalk-like," from creta "chalk." As a geological period (with a capital C-) between the Jurassic and the Tertiary, it is attested from 1851, a reference to the extensive chalk beds of southeastern England that were laid down during the Cretaceous and studied in the early years of geology. In reference to the chalk beds, cretaceous is attested in geology writing by 1832.
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