Experts have discovered 190 , 000 year - old elephant fossils , and remains of the yangshao and longshan cultures in the region 专家们在这一带发现了19万年前的古象化石，发现了仰韶文化河龙山文化遗迹。
For the past two decades , the prevailing view has been that humanity underwent a behavioral revolution around 40 , 000 years ago 过去20年来，学界的主流意见是：大约四万年前，人类经历过一个行为革命。
In the opinion of some geologists , there are evidences of the existence of man on the earth more than six hundred thousand years ago 依照某些地质学家的意见，有证据显示60万年前地球上就有人类存在。
It may still prove that grass was too rare 65 million years ago to be a major food source for gondwanatherians either 这一点可能尚待证明：青草在6500万年前也很稀少，还远远不能成为冈瓦那兽类的主要食物来源。
At that time , peking man ( an example of prehistoric man ) lived in zhoukoudian in the southwestern suburbs of beijing 远在70 50万年前，这里就是人类祖先的发祥地， “北京猿人”便在京西南的周口店等地繁衍生息。
The creature was about 20 feet long and lived 78 million years ago . the oldest known horned dinosaur in north america is called zuniceratops 该恐龙的体长约为20英尺6 . 1米左右，其生活年代则在距今7800万年前。
Yells : abandon all hope ! the legion has returned to finish what was begun so many years ago . this time there will be no escape 舍弃你们所有的希望吧！燃烧军团来完成万年前未竟的工作了！这次我们不会放跑任何东西！
Using radiometric dating methods , sugden determined that the ash settled into the fissure after a volcanic eruption 8 . 1 million years ago 萨格登使用了放射性测龄法，得出了火山灰是在810万年前沉积到裂缝中的结论。
The giant herbivores , which grew up to 35 meters long , lived during the late cretaceous period 83 - 65 million years ago 而这种巨大的食草动物成年后则可以长到35米长，它们生活在白垩纪末期约8300万年至6500万年前。
Since the ice age ended ten thousand years ago and warmer temperatures returned to the northern latitudes , many species have migrated north 自从一万年前冰河时代结束之后，北半球就开始变暖，许多物种开始向北迁移。
