煤炭和天然气主要用于发电，而石油主要用于给运输提供能量，但所有这些能源的价格是相互关联的。
Coal and natural gas are mainly used for electricity generation, whereas oil is used mostly to power transportation, yet the prices of all these energy sources are linked.
本文也将讨论三个主题，但这三个主题并不像第一篇文章讨论的三个步骤那样互相紧密关联，即它们相互之间不存在特定顺序。
I'll also discuss three topics in this article. These are not as tightly connected to each other as the three steps in the first article, and there is no particular order to them.
不同MRI检查结果相互关联，但关联大小依标准而不同。
Different MRI findings were associated with one another, but the magnitude of association varied by level.
证明存在相互关联是很容易的，但证明有因果关系则不然——不管其间的联系是多么明显。
Proving correlation is easy, but proving causation— despite how obvious the links may seem— is not.
证明存在相互关联是很容易的，但证明有因果关系则不然——不管其间的联系是多么明显。
Proving correlation is easy, but proving causation— despite how obvious the links may seem— is not.
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