An isotopic analysis of the grains has made that fear come true. 一項對這些顆粒的同位素分析讓這種擔心成真了。
Being a noble gas, it resists chemical bonding with other elements and is thus easy to purify for isotopic analysis. 由于氙是惰性的,不易與其他元素產(chǎn)生化學(xué)鍵,因此很容易純化以進(jìn)行同位素分析。