澳大利亚岩石艺术的年代一直在不断被修正，而且由于新的发现，人们提出了更早的测定年代。
The age of Australia's rock art is constantly being revised, and earlier datings have been proposed as the result of new discoveries.
这些矿物可以用放射性衰变技术测定年代，因为它们所含的放射性微量元素非常少。
These minerals can be dated by radioactive decay techniques because of the very small quantities of radioactive trace elements they, in turn, contain.
放射性碳测定年代的专家们还发现了在考古现场工作的各种优点。
Radiocarbon dating experts have also found advantages from working onsite with archaeologists.
如今，利用放射性碳素测定年代法，科学家已确定这一用乳齿象牙雕刻而成的长矛尖端的精确年代。
Scientists have now accurately carbon-dated the sharp tip that itself carved from mastodon bone.
研究者们拼凑了包括头骨，手掌，脚掌，上臂，腿和骨盆在内的125块骨骼碎片，并采集挖掘处上层和下层的火山土壤层测定年代。
Researchers have pieced together 125 fragments of bone - including much of her skull, hands, feet, arms, legs and pelvis - which were dated using the volcanic layers of soil above and below the find.
我预测铀-铅年代测定法将会成为一种越来越流行的年代测定方法。
I'll predict that Uranium-Lead Dating is going to become an increasingly popular dating method.
良好的年代测定是优秀分析的关键。
我要讲一种特殊的年代测定法。
事实证明，放射性碳年代测定法适用于许多史前艺术品。
It turns out that radiocarbon dating works for a lot of prehistoric art.
汤姆，你在考古学课上有没有讨论过放射性碳年代测定法？
Tom, in your archaeology class, did you talk about radiocarbon dating?
今天我想谈谈一种使我们能够确定一块土地或其他一些地质特征的年代的方法——年代测定技术。
Today I want to talk about a way in which we are able to determine how old a piece of land, or some other geologic feature is—dating techniques.
放射性碳年代测定法显示，亚马逊黑土中被烧焦的木头通常有1000多年的历史。
Radiocarbon dating shows that the charred wood in Terra Preta soils is typically more than 1,000 years old.
他们指出，只有一个实验室在没有得到其他实验室独立确认的情况下为夏维特进行了年代测定。
They noted that only one lab did the dating for Chauvet, without independent confirmation from any other lab.
地层学被用于测定可移动艺术品的年代。
这种年代测定法的一个问题是，有可能某一件东西从一个地方被带到了另外的地方，且被好几代人用了之后才被埋入土中。
A problem with this dating method is that an object could have been carried around, used for several generations before it was discarded.
就像我之前说到的，铀铅年代测定法已经存在一段时间了。
Like I said before, Uranium-Lead Dating has been with us for a while.
放射性碳年代测定法涉及到了化学分析，与文物中残留的有机物成分所释放的放射性碳的含量测定有关。
Radiocarbon dating had to do with chemical analysis, something to do with measuring the amount of radiocarbon that's left in organic stuff.
从阿拉斯加东南海岸岛屿的洞穴中提取的化石的放射性碳年代测定法表明，在最后一个冰河时代，该地区至少有一部分保持无冰状态。
Radiocarbon dating of fossils taken from caves on islands along southeastern Alaska's coast suggest that at least a portion of the area was remaining ice-free during the last ice age.
铀-铅年代测定法有一些相当令人兴奋的可能性。
There are a few pretty exciting possibilities for Uranium-Lead Dating.
钻石是稀有火成岩（称为煌斑岩和金伯利岩）中偶尔出现的一种成分，其年代测定方法从未令人满意。
Diamonds, an occasional component of rare igneous rocks called lamproites and kimberlites, have never been dated satisfactorily.
它使用于放射性碳年代测定法。
碳的年代测定工作是将碳14(碳处于这种状态并不常见，也不稳定)与碳12(碳的常见状态)的含量进行对比。
Carbon dating works by comparing the amount of carbon 14, which is a less common and less stable form of carbon, to the more abundant carbon 12.
这个星期，于去年开始的年代测定结果被公布，使这部书的年代比学者之前推测的要提前一个世纪，也因此粉碎了许多关于其起源的学说。
The dating, carried out last year but announced this week, makes the book a century older than scholars had previously thought and quashes some theories about its origin.
一些基因和年代测定的研究指出远古美国人可能来自其他地方，而且比北美洲的克伦维斯人来的早。
Some genetic and time-dating studies point to the possibility that ancient Americans came from other places and arrived earlier than Clovis sites in North America.
总共有485块锆石内部带有包体，其中有十几块包体中含有放射性微量元素，研究者可以根据它们来测定包体的年代。
A total of 485 zircons held inclusions, and about a dozen or so of these contained radioactive trace elements that allowed the researchers to determine their ages.
不同年代测定技术显示，熔岩的年代介于4,000年到71,000年之间。
Different dating techniques have placed the age of this lava between 4, 000 and 71, 000 years old.
不同年代测定技术显示，熔岩的年代介于4,000年到71,000年之间。
Different dating techniques have placed the age of this lava between 4,000 and 71,000 years old.
撇开精确的年代测定参数不说，这幅展出的马赛克地毯令人印象深刻。
Arguments on accurate dating aside, the carpet Mosaic on display is impressive.
这种被称为再羟基化年代测定法的技术，最近才由曼彻斯特大学和爱丁堡大学的研究员开发出来。
Called rehydroxylation dating, the technique was recently developed by researchers at the University of Manchester and the University of Edinburgh.
这种被称为再羟基化年代测定法的技术，最近才由曼彻斯特大学和爱丁堡大学的研究员开发出来。
Called rehydroxylation dating, the technique was recently developed by researchers at the University of Manchester and the University of Edinburgh.
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