The bat judges distances by a kind of echo-location.

蝙蝠用一种回声定法来判断距离。

Well, I know we start by discussing the shortcomings of carbon dating.

我道我们一开始 是讨论碳年代定法的缺点。

Almost 100 years later, Rosalyn Yalow, a medical physicist, and Solomon Berson, a physician, invented the radioimmunoassay in 1960.

将近 100 年后，医学物理学家罗莎琳·亚洛和内科医所罗门·伯森在 1960 年发明了放射免疫定法。

Carbon dating has revealed that some specimens of Welwichia are upwards of 3,000 years old.

碳年代定法显示，某些Welwichia标本的历史可追溯至3000多年前。

However, carbon dating concluded that none of the bones are from this period.

然而，碳年代定法得出结论，这些骨头都不是来自这个时期。

Next, they turned to carbon dating for answers and found the bones were 400,000 years old.

接下来，他们转向碳14定法寻找答案，发现这些骨头有40万年的历史。

Clinical specimens were tested with an rRT-PCR assay that was developed from the publicly released virus sequence.

使用根据公开发布的病毒序列开发的 rRT-PCR 定法对临床标本进行试。

The result is Spiroscout, an inhaler with a built-in Global Positioning System locator and (in advanced models) a wireless link to the internet.

其结果就是一款名为定法侦察员的吸入器问世，这款吸入器带有内置的全球定位系统定位和（高级型）联到互联网的无线连接。

He said carbon dating methods were used to link the footprint to the same time period as plant material found in the area.

他表示通过碳年代定法将这枚足迹与该地区发现的同时代植物化石进行了联系比较。

Radiocarbon dating on pottery suggests that the sweet potato was a staple crop in Polynesia as early as 1000 a.c.e...

碳-14年代定法表明， 甜薯早在公元1000年就在波利尼西亚成为主食作物。

The lack of radio-carbon dating and the fact that the land above it has never been part of a large estate make the origins of the site a mystery.

由于缺乏放射性碳年代定法， 而且其上方的土地从未成为大型庄园的一部分， 这使得该遗址的起源成为一个谜。