It is useful to introduce a shorthand notation to facilitate the identification of various isotopes . 为了便于区别各种不同的同位素，引进简化的符号是很有用的。
Its most durable isotope survives only about 200, 000 years-a minute span on a stellar scale . 最持久的同位素只能存在大约二十万年--这在恒星的尺度上是一个很短的时间。
An obvious restraint in the use of isotope ratios results from the need to employ mass spectrometers . 使用同位素比值法有着一个明显的局限因素，就是要用质谱仪进行分析。
Ordinarily, this mixture means little because the various isotopes are almost indistinguishable in most of their properties . 在一般情况下，这种混合是无所谓的，因为各种同位素在它们的主要属性上几乎是无法区别的。
Sydney , you will recover kamarov and the isotope 西德妮,你负责卡马若夫和同位素
Study for monitoring tech of new model isotope tracer 新型同位素示踪监测技术的研究
Water isotope technology for tracing groundwater movement 水同位素技术示踪地下水活动
Simmons : get me a sample and some isotope readings 弄些样本和同位素读数。
This time , it is carbon isotopes that give the game away 这一次是碳同位素泄露了秘密。
We can assume he will be selling the isotope 我们猜测他准备卖掉那同位素
