万年

We find evidence for a metastable zone of euxinic waters impinging on the continental shelf and sandwiched within ferruginous deep waters.

他们的结果表明，在埃迪卡拉纪时（它处于6亿3500万年之前至5亿4200万年之前之间）地球上的海洋是层化的，其中某些层区为硫化物水域和富含铁的水域。

The Peking Man cave piles up thick more than 40 rices in layer, according to to the Peking Man skeleton fossil, stone implement, use the research of fire historic relic etc., archeologists think that the Peking Man lives about at be apart from now from 70 ten thousand yearses to 20 ten thousand yearses.

北京人洞穴堆积层厚40多米，根据对北京人骨骼化石、石器、用火遗迹等方面的研究，考古学家们认为北京人大约生活在距今70万年到20万年。

Using sophisticated fossil dating techniques, Rink determined that the primate, known to scientists as Gigantopithecus blackii, lived between 300,000 and a million years ago. Humans also existed in the area at that time.

经过尖端的化石年代定位技术的测定， Rink 教授断定这种哺乳动物就是科学家熟知的Gigantopithecus blackii，生活在30万年到100万年以前，那是人类已经存在了。

Pleistocene The first epoch of the Quaternary period , which started with a glaciation about two million years ago and ended with the last glaciation about 10000 years ago.

更新世：指第四纪的第一世，从大约200万年前的冰河时期开始，到约1万年前的最后一次冰河作用结束。

The last glacial,from 80 000 years BP to 10,000 years BP,can be divided into three stages,i.e.,early and later glacial stages and interglacial in the middle.

末次冰期，距今8万年到1万年，可分为三个阶段，早、晚冰段和中间的间冰段。

Scientists examined one of the creature's thigh bones and noticed unusual features in the marrow cavity.

报道说，研究人员对其它恐龙化石重复了实验，一个是8000万年前鸭嘴龙的化石样本，还有两个6500万年前的暴龙化石样本，结果都得到了类似于现代动物骨胶原的软组织，并可以观察到其中的血管和细胞结构。

The site was marshy from about 3. 3 million to 3. 1 million years ago

这里在大约330万年到310万年前是一个沼泽。

The archaeological find was between 146 and 152 million years old and of "huge scientific value" according to paleontologist Octavio Mateus.

马蒂斯表示，这个考古学上的发现可能有一亿四千六百万年至一亿五千两百万年的历史，极具「科学价值」。

By the Mesolithic , hunting strategies had diversified with the developent of the bow (by 18,000 years ago) and the domestication of the dog (about 15,000 years ago).

到了石器时代，狩猎的策略已经多元化同弓（由1.8万年前）和狗的驯化（约1.5万年前）项目概况。

About 200,000 years ago Europe and the Near East were colonized by Neanderthal man, extinct by 20,000 following the appearance of modern humans in the region from 40,000 years ago.

大约20万年前，尼安德特人在欧洲和近东殖民；4万年前现代人在该地区出现后，2万年前尼安德特人灭绝。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。