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。
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。
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。
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。
The best fuels for fusion are two types, or isotopes, of hydrogen - deuterium and tritium.
最好的核聚变材料有两种，即氢的同位素——氘和氚。
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。
Today almost all of the world's supply of medical isotopes comes from just five reactors (see map).
目前几乎全世界的医用同位素都产自五座反应堆(见图2)。
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。
Looking at these isotopes allows the chondrules to be dated, and they were formed 4.56 billion years ago.
观察这些同位素可以估算出陨石球粒的年龄，他们是在45.6亿年前形成的。
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。
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。
In this scenario, hydrogen would no longer be stable, but its slightly heavier isotopes deuterium or tritium could be.
在这个设定中，氢不再是稳定的，但是其更重些的同位素氘和氚却是稳定的。
Oxygen and strontium isotopes, which are fixed in dental enamel at the time of tooth formation, were tested in 18 subjects.
在18件样本上检测了氧和锶的同位素。这两种元素在牙齿成型时，会固定在牙釉质上。
Fusing heavy hydrogen isotopes requires lots of energy, partly because the nuclei are positively charged and repel each other.
融合重氢同位素需要大量能量，部分原因是因为原子核带正电并相互排斥。
The evidence lies in ocean mud, in fossil pollen, and in changes in ratio of chemical isotopes that record shifts in temperature.
证据就存在于海洋泥土，花粉化石和记录温度变化的化学同位素比值变化之中。
The collision spit out neutrons to create two isotopes of an element with 117 protons, one with 176 neutrons and the other with 177.
撞击会生成两种拥有117个质子的同位素，其中一种元素有176个中子，而另一种元素有177个中子。
They looked at how the ratios of oxygen isotopes locked in the corals' carbonate skeletons varied month by month as the colonies grew.
他们研究了珊瑚碳酸盐骨骼中留存的氧同位素比例随珊瑚的生长逐月发生变化的情况。
Yet Australia has problems of its own with its single, albeit newish reactor, and has recently been importing isotopes from South Africa.
尽管澳大利亚唯一的反应堆还是较新的，但仍存在不少问题，最近澳大利亚一直在从南非进口同位素。
Now, a team has attempted to solve the mystery by comparing the ratio of two isotopes, or forms, of chlorine in lunar and terrestrial rocks.
目前，一个研究小组打算通过对比月球和地球岩石中氯的两种同位素，或两种形式的氯来解决这个疑团。
Now, a team has attempted to solve the mystery by comparing the ratio of two isotopes, or forms, of chlorine in lunar and terrestrial rocks.
目前，一个研究小组打算通过对比月球和地球岩石中氯的两种同位素，或两种形式的氯来解决这个疑团。
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