Its chemistry, pristine because of the Wilcocks' swift action, showed that the water in it nevertheless had the same isotopic composition as water on Earth.

由于威尔科克斯的迅速行动，它的化学成分是原始的，表明其中的水与地球上的水具有相同的同位素组成。

This, by studying the isotopic composition of ancient silver coins, has tried to draw conclusions about where the metal in a coin was mined, and thus about patterns of trade.

这通过研究古代银币的同位素组成，试图得出关于硬币中的金属是在哪里开采的结论，从而得出关于贸易模式的结论。