它们晶体里重轻同位素的比例并不像是从地底挖出来的东西那样。
The ratio between the heavy and light isotopes of the element in their crystals is not quite right for stuff that has come out of the ground.
重量较大的氧来自某种自然过程，在此过程中，大部分的轻同位素留在了形成太阳的部分星云中。
And the heavier oxygen from a natural process that left more of the light isotope in the part of the nebula that made the sun.
重量较大的氧来自某种自然过程，在此过程中，大部分的轻同位素留在了形成太阳的部分星云中。
And the heavier oxygen from a natural process that left more of the light isotope in the part of the nebula that made the sun. So we are made of star stuff.
冰河时期海洋中多空虫贝壳化石中积聚的较重的氧同位素比较多，而另一种轻的氧同位素则更多地积聚在古代冰层和积雪中。
During glacial periods, the forams' shells contain more of the heavier of two oxygen isotopes, as the lighter one is preferentially accumulated in snow and ice rather than the ocean.
实验分析的数据首次表明：铀氧化物中的氧同位素主要是富轻氧的。
Data from the analytical results show that the oxygen isotopes in analysed uranium oxides is mostly light oxygen.
稀有气体同位素地球化学研究也在一定程度上揭示了牦牛坪轻稀土矿化与地幔过程之间存在着成因关系。
The rare gas isotope geochemical analyses also support that there is a genetic association between the light rare earth element mineralization and mantle processes.
湘桂走廊地区大气降水明显的富集轻硫同位素（32S），而珠江三角洲地区则富集重硫同位素（34S）。
It is indicated that the sulfur isotopic composition of precipitation of Xiang-Gui Corridor is enriched in 32S, however, which of the Pearl River Delta is enriched in 34S.
本文利用轻烃(C_1—C_7)和碳同位素分析资抖，对滨海地区浅层天然气成因进行探讨。
This paper gives a discussion on the origin of natural gas in the shallow reservoir in Binhai area, by a study of light hydrocarbons (C_1-C_7) and carbon isotopes.
某种元素的同位素有几种轻微不同的化学性质，生命体选择轻的同位素。
Isotopes of an element have slightly different chemical properties, and life prefers to use the lighter isotopes.
某种元素的同位素有几种轻微不同的化学性质，生命体选择轻的同位素。
Isotopes of an element have slightly different chemical properties, and life prefers to use the lighter isotopes.
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