当史蒂文森依据碳-14的痕迹追溯过去时，他发现碳-14的含量随着太阳燃烧的强度而变化。
When Stevenson followed the carbon-14 trail back in time, he found carbon-14 levels change with the intensity of solar burning.
而且这也将是全球第一次处理追溯过去很长一段时间的外部成本。
And it will be the first time the globe has tackled the question of externalities over a long time period.
如果你追溯过去，即使你看得远一点，你也会发现我们改变了很多我们想要改变的东西。
If you look back, even if you look back even further, you see many times we have had to change the lines on what we wanted to do.
其中一些可以追溯到200年前，反映了我们地区过去两个世纪的历史。
Some of them date back 200 years, which reflect the history of our area over the last two centuries.
其它特征，如超长前臂和灵活的脚，则可追溯更远灵长类动物的过去。
Others, such as extra-long forearms and flexible feet, date from deeper in the primate past.
过去能够成功采用的追溯策略不一定永远有效。
A traceability strategy that was successfully employed in the past cannot be expected to remain valid forever.
一位追溯该狼群过去40年基因和社会关系的生物学家GordonHaber说，此后，几头狼群成员曾回去寻找这头母狼，而它们自己也被杀了。
Since then, says Gordon Haber, a biologist who has traced the pack's genetic and social bonds back 40 years, several pack members have returned to look for the female and themselves been caught.
爱因斯坦依然是现代最伟大的科学家，即使是追溯历史，在过去的2400年中，也只有牛顿、伽利略和亚里士多德才能与之比肩。
Einstein remains the foremost scientist of the modern era. Looking back 2,400 years, only Newton, Galileo and Aristotle were his equals.
随着科学家从北极运来更多的沉淀物岩心，波里·亚克及其合作者想了解更多过去冰范围的详细信息，并将此类信息在时间上进一步向后追溯。
As scientists pull more sediment cores from the Arctic, Polyak and his collaborators want to understand more details of the past ice extent and to push this knowledge further back in time.
这种研究方法不必对实验对象的过去进行长时间的追溯。
Those kinds of studies don't let one go back a long, long time in the lifespan.
其他特征，比如特别长的前臂以及灵活的双脚，这些可以追溯到我们过去的灵长类祖先很晚才具有的特征。
Other features, such as extra-long forearms and flexible feet, date from deep in our primate past.
过去的世界聆听起来如何？当然，即使我们像本周一样，努力追溯回宇宙洪荒的远古时代，我们仍旧没能得到任何确切的答案。
What does the past sound like? Of course, when we're as far back in deep time as we are this week, we can have no real idea.
如果他们所做的，在过去是合法和正确的，为什么要给予他们追溯免疫力？
If what they did in the past was legal and proper, why is it necessary to grant them retroactive immunity?
秘会，它的字面意思是用钥匙锁着，可以追溯到过去红衣主教被锁住直到他们选择一位新教皇。
Conclave, which literally means locked with a key, dates back to a time when cardinals were locked in until they chose a new Pope.
这种趋向可以追溯到过去数代。
另一个不同之处在于，我们从结尾开始，向前追溯。这会让你有所回报，在挖掘过去的过程中，我们往往会发现一些早被遗忘的有趣事实。
Another is that we start at the end and look backward. There's some reward in this, in the excavating we do that often unearths interesting, long-forgotten facts.
过去常被钉在教室墙上而且常出现在地图册中的那幅地图以墨卡托投影著称，最早是由弗兰德地理学家杰拉杜斯·麦卡托提出来的，可追溯至1569年。
The map you're used to seeing pinned on classroom walls and in Atlases is known as a Mercator projection, and was first presented by the Flemish geographer Gerardus Mercator back in 1569.
追溯逝去的时间，我们可以探索过去、探知未来。
Excavating back through time, we can discover our past and, perhaps, our future.
通过亨伯特对过去的描述追溯爱伦·坡的诗歌，你有什么发现?。
Track the Poe Poem Through Humbert's Accounts of His Past, and What Do You Have?
这个站名来源于大北方之路过去一家名为“天使”驿站，可以追溯到17世纪。
It's named after a former coaching inn on the Great North Road called the Angel, dating from the 17th century.
我们两国人民之间的传统的友谊，可以追溯到遥远的过去。
The traditional friendship between people in our two countries can be traced back to far past.
答案要追溯到很久之前，这是个古老的传统，他们过去用手工计算。
The answer is — this goes way back — it's an old tradition and they used to have to do this by hand.
答案要追溯到很久之前，这是个古老的传统，他们过去用手工计算。
The answer is — this goes way back — it's an old tradition and they used to have to do this by hand.
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