The age of the earth is reckoned at about 4 600 million years.
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2. 该大陆地壳最古老的那些部分有40亿年了。
The most ancient parts of the continental crust are 4000 million years old.
《柯林斯英汉双解大词典》
3. 怎么可能是在45亿年之后呢？
How could it be after four and a half billion years?
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4. 这意味着它在40亿年的时间里失去了质量。
This would mean that it had lost mass over the course of four billion years.
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5. 它一定非常古老，大约有40亿年，有几亿年的误差。
It must be really old, about 4 billion years, give or take a few hundred million years.
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6. 也就是处在2500亿年到5000亿年间的“地球”。
That is, anywhere from 250 billion to 500 billion "earths".
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7. 通过这种方法，科学家们获得了火星南部高地40亿年到最年轻的火山地区（几亿年）的年龄估计数。
Age estimates ranging from four billion years for Mars's southern highlands to a few hundred million years in the youngest volcanic areas were obtained in this way.
Another more intriguing possibility is that the genetic information needed to make toes somehow survived for tens or perhaps hundreds of millions of years in the lizards and was reactivated.
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9. 其他世纪都延续了上亿年。
Other epochs have lasted millions of years.
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10. 它们仅仅是在1亿年以前形成的。
They were formed only 100 million years ago.
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11. 此次爆发发生在122亿年以前。
The burst took place 12.2 billion years ago.
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12. 地球上的生命是在38亿年以前开始出现的。
Life on Earth probably began 3.8 billion years ago.
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13. 月球年龄可能比人们普遍认为的要小2亿年。
It may be 200 million years younger than widely believed.
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14. 另一个参考认为鲎虫也许已经存在了3亿年。
Another reference states tadpole shrimp may have been living for 300 million years.
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15. 比起人类来，地球健康的很，都45亿年了。
Compared to the people, the planet is doing great. Been here four and a half billion years.
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16. 在大爆炸后，宇宙经历了大约2亿年的黑暗期。
After the big bang, the universe stayed dark for about million years.
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17. 峡谷岩石的层次显示了它约有20亿年的历史。
The canyon's rock layers display a geological history some two billion years old.
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18. 就算是上百上亿年，你也不会猜的出来…一根跳绳！
You'd never guess in a million billion years. — a jumping rope!
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19. 现代太空尘埃由恒星形成100亿年之后喷发出来。
Modern space dust blows off stars that formed about 10 billion years ago.
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20. 相比起地球的约45亿年的年龄，这算是刚刚诞生。
Compared with Earth, which is about 4.5 billion years old, these are newly minted.
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21. 蟑螂是现存最久的有翼昆虫，已有3亿年的历史了。
The cockroach is the oldest extant winged insect, dating back more than 300 million years.
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22. 它已经有36亿年的历史了，我们只不过是匆匆过客。
Its 3.6 billion years old. We're all just passing through.
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23. 伊林沃思说：“新相机把科学前沿又向宇宙的起点推进了数亿年。”
"The new camera has pushed the frontier a few hundred million years closer to the beginning, " Illingworth says.
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24. 所有的担忧都没了，因为地球也不过，会存在不超过50亿年。
All the worries are over, because the Earth is not going to survive for any more than five billion years.
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25. 前三个时期合起来持续了40亿年，合称为前寒武纪（隐生宙）。
The first three eons, which together lasted nearly 4 billion years, are together known as the Precambrian.
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26. 在地质学社会期刊中，研究人员称，该蛛网有1.4亿年的历史。
Writing in the Journal of the Geological Society, the researchers say the amber dates back 140 million years.
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27. 新的研究显示，地球磁场存在的迹象能够再回推大约2.5亿年。
Evidence for the existence of Earth's magnetic field has been pushed back about 250 million years, new research suggests.
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28. 这个数千星系的全色全景图像展示了超过120亿年的宇宙历史。
More than 12 billion years of cosmic history are shown in this panoramic, full-color view of thousands of galaxies.
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29. 蝎子具有非常大的适应性，这种品种已经在世界上存活了几亿年了。
Scorpians have survived for hundreds of millions of years by being extremely adaptable.
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30. 蝎子具有非常大的适应性，这种品种已经在世界上存活了几亿年了。
Scorpians have survived for hundreds of millions of years by being extremely adaptable.
