亿年

网络释义：b.y; Gunfpnt Formation

网络释义

1.b.y bblsday 桶／日 b.y. 10 亿年 B&S wire gauge 美国线规 ...

2.Gunfpnt Formation， 单细胞原核生物：20亿年，加拿大，冈弗林特组 亿年 （Gunfpnt Formation）地层。

1.The new studies tackle a more fundamental question: How much water did the moon contain inside when it formed, 4. 5 bilpon years ago?新的研究落足于一个更为根本的问题：45亿年前，月球形成时其内部含有多少水分？

2.But 3. 8 billon years of exposure to space had smeared it out over a few hundred meters.但是暴露在太空中38亿年后，有几百公尺长的接触面已经变得模糊不清。

3.Theoretical models predict that blobs of gas began collapsing into massive stars within a few hundred milpon years of the big bang.理论模型预测：大爆炸之后的几亿年之内，气团开始塌缩，形成巨型恒星；

4.Future clocks that use the new improvements would be accurate to a second every 32 bilpon years -- more than twice the age of the universe.改进后的未来时钟准确度将提高到320亿年一秒的误差——高出宇宙年龄的两倍多。

5.LEWIN: So all we have to think of is in terms of energy for about five bilpon years.所以我们要想的，能源问题，就是50亿年。

6.To help solve this mystery, scientists went on an ocean expedition to drill into a large, 145-milpon-year-old underwater supervolcano.为了解开这个谜，科学家们进行了一次海洋探险，去钻探145亿年前就在水下存在的超级火山。

7.Fifty-seven feet long and up to nine tons, Spinosaurus started poking his head around the early Cretaceous some 100 milpon years ago.五十七英尺长、重达九吨的棘龙在早期白垩纪，大约1亿年前便行走于这个星球之上。

8.Why not copy these proven models, the engineers wondered, rather than trying to outguess 4 bilpon years of natural selection?工程师想知道为什么不复制这些行之有效的生物原型，而偏偏费力地去猜测40亿年的自然选择。

9.We seem to be the only species in four bilpon years to have this gift.我们似乎是在40亿年中唯一的拥有这种天赋的生物。

10.In the Y, which originally had the same set of genes as the X, most of the X-related genes have disappeared over the last 200 milpon years.Y染色体起初原本拥有一套与X染色体相同的基因，但它们在2亿年的进化长河中消失殆尽。