Such anomalies are due to the relative abundance of the "isotopes" or varieties of each element.

这种反常现象是由于同位素比较丰富或者各个元素比较多样化。

The isotopes of a given element have the same chemical properties but slightly different physical properties.

一个特定元素的同位素具有相同的化学特征，但在物理性质上有一些细微差异。

Most hydrogen and oxygen atoms in water are stable, but traces of both elements are also present as heavier isotopes.

在水中大多数氢原子和氧原子是稳定的，但这两个元素也有微量以较重的同位素形式存在。

She had often carried test tubes containing radioactive isotopes in her pocket, remarking on the pretty blue-green light they gave off.

她经常把装有放射性同位素的试管放在口袋里，对试管里发出的漂亮的蓝绿光赞不绝口。

By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline.

通过测量一束头发上较重的氢和氧同位素的比例，科学家可以构建一个地理时间轴。

All the isotopes of a given element have the same number of protons, but differ in their number of neutrons, and hence in their atomic mass.

给定元素的所有同位素都含有相同的质子数，但它们的中子数不同，因此它们的原子质量也不同。

Heavier isotopes tend to be left behind when water evaporates from the ocean surfaces, the remaining ocean water becomes progressively enriched in oxygen 18.

当水从海洋表面蒸发时，往往会留下较重的同位素，所以剩余的海水会逐渐富含氧18这种同位素。

Researchers' clues to the Eemian climate come from measurements of the ratios of two slightly different types of oxygen, isotopes oxygen-16 and oxygen-18, preserved in the GRIP core.

研究人员对间冰期气候的线索来自保存在 GRIP 冰芯中的两种略微不同类型的氧——即同位素氧-16和氧-18的比率。

About the same time, though, scientists realized comets might contain decaying radioactive isotopes that could have warmed cometary interiors to temperatures that caused the interiors to evolve.

然而，大约在同一时间，科学家们意识到彗星可能含有衰变的放射性同位素，这些同位素可能使彗星内部的温度升高到导致内部进化的温度。

We talked about isotopes, and whatnot.

我们已经讨论了同位素等。

But isotopes can do more.

但是同位素的用处更多。

The technique dependsupon studying isotopes.

这项技术依赖于对同位素的研究。

The technique depends upon studying isotopes.

这项技术基于对同位素的研究。

Rhenium isotopes are used to treat liver cancer.

铼的同位素被运用于肝癌的治疗。

Isotopes Say New Origin Stories for Some planets.

听同位素讲述行星起源的故事。

This time, it is carbon isotopes that give the game away.

这一次是碳同位素泄露了秘密。

Two types, or isotopes, of hydrogen are used - deuterium and tritium.

它使用两种类型，或称同位素，的氢——氘和氚。

Isotopes are different atomic versions of a particular chemical element.

同位素是一个特定化学元素的不同原子变种。

If they are found on the same place, it is iso-topos. These are called isotopes.

如果是在同一个位置，按照国际惯例，它们被叫做同位素。

The inventors called their idea Silex, for separation of isotopes by laser excitation.

这两个发明者称他们的想法为“捷希凯”，就是用激光激发的同位素分离。

The Standard Model makes clear predictions for the ratios of various isotopes of all three.

标准模式理论会很清楚地预测到这3中元素的多种同位素出现的比率。

With this shortage of medical isotopes looming worldwide, other countries have begun to act.

随着医用同位素短缺的危机蔓延全球，其他国家开始展开行动。

Oxygen isotopes vary with the water cycle, and sulfur with bedrock, so they're location proxies.

氧同位素会随着大气水循环而变化，硫同位素则根据地球岩床的不同而变化，通过它们我们就能确定地理位置。

Once the reactor has shut down, there remains "decay heat" from traces of other radioactive isotopes.

一旦反应堆关闭，它仍热存在有来自其他放射性同位素踪迹的衰变热。

The most dramatic effect would have been on the formation of lithium, an element that has two isotopes.

效果最为强烈的便是锂元素的形成，这种元素有两种同位素。

In any event, Iran could buy medical isotopes it needs from private suppliers, as most other countries do.

不管怎样，伊朗可以从私人供应商那里买到医用核素，正像大部分其他国家那样。

That water signature is in the form of oxygen isotopes, atoms of oxygen with different Numbers of neutrons.

这个特征就是氧的同位素，它是由氧原子和不同数量的中子组成的。

Sharp and his colleagues studied what happened to two isotopes of the element chlorine during that process.

夏普和他的同事对此过程中两种氯同位素的情形进行了研究。

Sims USES radioactive clocks to decipher volcanic processes, measuring and comparing two isotopes of radon.

西姆斯使用放射性计时器测定并比较氡的两种同位素，以此来解密火山的活跃程度。