科学家将白垩纪末期的大灭绝与地球上的陨石撞击联系起来。
Scientists have linked the mass extinction at the end of the Cretaceous with a meteorite impact on Earth.
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。
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.
它说明了虱子的历史非常久，在白垩纪-早第三纪过渡期之前，而且也肯定是寄生在某种生物上的。
It says lice are old, predate the Cretaceous-Paleogene boundary, and must have been living on something.
本文在讨论白垩纪火山杂岩岩石学和岩石化学特征的基础上，对火山杂岩的构造环境和成因机制作了分析。
This paper analyses the tectonic environment and genetic mechanism for volcanic complex after discussing the petrology and petrochemistry characteristics of Cretaceous volcanic complex.
白垩纪末期，当小行星撞击地球使得地表上的光合作用停止。生长速度较快的恐龙无法在这场危机中幸免于难。
Fast-living dinosaurs were unable to survive the crisis at the end of the Cretaceous, when an asteroid hit Earth and brought photosynthesis to a halt.
最近发现的这张蜘蛛网是白垩纪的，那时候，地球上还有恐龙在行走。
The web found recently dates to the Cretaceous period. At that time, dinosaurs walked the earth.
现今的磷灰石裂变径迹年龄格局基本上受控于白垩纪的快速抬升冷却事件，但最后为晚期活动断裂所定格。
The present AFT age pattern is, therefore, basically controlled by the Cretaceous rapid cooling event but finally shaped through active faults.
白垩纪是地质史上一个典型的温室气候时期，国际上围绕白垩纪气候成因开展了一系列模拟研究。
The Cretaceous is a typical period for greenhouse climate in geological history and has become an important paleoclimate simulation period in international paleoclimate modeling community.
从起源上看， 被子植物的古特有属主要发生于晚白垩纪和早第三纪，地质历史上大都占有广阔的分布区；
The relic genera once occupied huge areas in North Hemisphere in the Tertiary or the late Cretaceous, while neo-endemism was mostly originated in the late Tertiary .
从起源上看， 被子植物的古特有属主要发生于晚白垩纪和早第三纪，地质历史上大都占有广阔的分布区；
The relic genera once occupied huge areas in North Hemisphere in the Tertiary or the late Cretaceous, while neo-endemism was mostly originated in the late Tertiary .
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