These animals were not as sensitive to climate changes in the Cretaceous period as they are today.
这些动物在白垩纪对气候变化不像今天这样敏感。
Changes in climate before the Cretaceous period caused severe fluctuation in sea level, resulting in the extinction of the dinosaurs.
白垩纪以前的气候变化导致了海平面的剧烈波动，引发了恐龙的灭绝。
Not exactly outer space then, or the Cretaceous period.
而并不是外太空或是白垩纪。
The Cretaceous Period was about 120 million years ago.
白垩纪时代大约是一千二百万年以前。
From the view of stratigraphy, they all belong to the Cretaceous period.
从地层学上看，它们都属于白垩纪。
From the view of strati graphy they all belong to the cretaceous period.
从地层学上看，它们都属于白垩纪。
Xixia ruins belong to the Cretaceous period dinosaur rift sedimentary basin.
西峡恐龙遗址属于白垩纪断陷盆地沉积。
In Australia, this happened about 60 million years ago in the Cretaceous Period.
在澳洲，约60万多年前发生在白垩纪。
The prehistoric reptile lived in the cretaceous period about125million years ago.
这只史前爬行动物生活在约一亿两千五百万年前的白垩纪。
The prehistoric reptile lived in the Cretaceous period, about 125 million years ago.
这只史前爬行动物生活在约一亿两千五百万年前的白垩纪。
Pteranodons lived 60 million years ago. That time was called the late Cretaceous period.
无齿翼龙生活在6000万年前，这个时候是白垩纪晚期。
Looking at... Triceratops: a Dinosaur from the Cretaceous Period New Dinosaur Collection.
望着……三角龙：从白垩纪的恐龙(新恐龙收集)。
The web found recently dates to the Cretaceous period. At that time, dinosaurs walked the earth.
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。
Fossils of Caproberyx indicate they swam the waters of Europe and Africa during the Cretaceous period.
多骨刺鱼的化石显示白垩纪时它们在欧洲和非洲的水域中游弋。
One was an isolated feather dating from the Cretaceous period (about 100m years ago) that was found in Brazil.
其中一个是在巴西发现的白垩纪（约1亿年前）的一根羽毛。
They date from the early Cretaceous period, which began around 145 million years ago and ended 65 million years ago.
据悉，他们最早生活在白垩纪早期，亦即1亿4千5百万年前到6千5百万年前。
This 65.5-million-year-old layer of Earth separates fossils of the Cretaceous period from those of the Tertiary period.
这个有着6550万年历史的地层分离了白垩纪的化石和第三纪的化石。
The temperature drop during the Cretaceous period would almost certainly have wiped out an 'abundance' of the world's dinosaurs.
曾经称霸地球显赫一时的恐龙，在白垩纪时代的这次温度巨变中，似乎全都灭绝了。
Scientists believe that during the Cretaceous period, a spate of volcanic activity caused plant life to bloom on the surface of the oceans.
科学家认为，在白垩纪，一连串的火山活动导致植物在海平面生长旺盛。
Its discovery pushes back the date of when flowering plants diversified to around 127 million years ago, during the early Cretaceous period.
这项发现将开花植物开始多样化的时间推到了大约一亿两千七百万年前，那时正是白垩纪的早期。
The Protoceratops was a vegetable-eating dinosaur about the size of a sheep that experts believe lived in herds during the Cretaceous Period.
原角龙是一种食草恐龙，体型和绵阳差不多大小。专家们都认为他们曾在白垩纪时期过着群居的生活。
Wang says that sediments in the areasuggest that the pterosaurs died in a large storm about 120 million years agoin the Early Cretaceous period.
王晓林还从该地区的沉积物推测道：“在大约1.2亿年前的白垩纪早期，一场强大的风暴夺走了这些翼龙的生命。”
Some 65.5m years ago, at the end of the Cretaceous period, the Earth collided with an asteroid and the biggest terrestrial beasts in history were no more.
大约在6550万年以前，也就是在白垩纪末期，地球与一颗小行星发生碰撞，此后这种史上陆地最大的动物便由此绝迹了。
Microraptoris one of many small, feathered dinosaurs found in what is now China that were alive during the Cretaceous period more than 66m years ago.
小盗龙，生活在距今六千六百多万年前的白垩纪，是现今中国境内发现的众多体型娇小、长有羽毛的恐龙之一。
Mosasaurs breathed air and were powerful swimmers that were well-adapted to living in the warm, shallow epicontinental seas prevalent during the Late Cretaceous Period.
默兹河蜥必须呼唤空气生存，白垩纪后期浅浅的陆缘海随处可见，默兹河蜥已经很好地适应了这种环境，成为十分强劲的游泳能手。
Tyrannosaurus rex arose during the Cretaceous period about 85 million years ago and thrived as a top land predator until the dinosaurs went extinct 20 million years later.
霸王龙出现，在白垩纪时期约85万年前，和蓬勃发展作为最高的土地捕食，直到恐龙灭绝二千万年后。
But nearly 100 million years ago relatives of modern snakes undulated through Cretaceous period waters aided by a paddlelike tail and dragging a pair of short, footless hind legs.
但是在将近1亿年前，现代蛇类的近亲们靠着它们船桨似的尾巴在白垩纪的水流里随波起伏，拖曳着它们短小而笨拙的后腿。
But nearly 100 million years ago relatives of modern snakes undulated through Cretaceous period waters aided by a paddlelike tail and dragging a pair of short, footless hind legs.
但是在将近1亿年前，现代蛇类的近亲们靠着它们船桨似的尾巴在白垩纪的水流里随波起伏，拖曳着它们短小而笨拙的后腿。
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