The answer lies in a slightly obscure but ingenious field known as isotope geochemistry.

答案在于同素学，这是个不大知名而又十分奇妙的领域。

His definition of " geochemistry" stretches, however, well beyond many people's, into political and economic history.

然而，他对“学”的定义远远超出很多人的定义，延伸到政治和经济史上。

I need to talk to somebody who knows more about geochemistry than I do I think for that one.

需要与一想象的更解学的人交谈。

So the Clark Fork geochemistry explains why acid rain isn't as devastating here as it is in, say, the Adirondack Mountains of New York where there is no limestone.

因此，克拉克福克学解释为什么酸雨在这里不像在没有石灰岩的纽约阿迪朗达克山脉那样具有破坏性。

Geology is the study of the Earth's physical structure and substance, while geochemistry is a branch of chemistry that focuses on the chemical composition of reactions in rocks and minerals in the Earth's crust.

质学是对物理结构和物质的研究，而学是学的一个分支，侧重于壳中岩石和矿物反应的学成分。