Theophylline, a close structural relative of caffeine and the major stimulant in tea, was one of the most effective compounds in both regards.

茶碱是咖啡因的近亲，也是茶中的主要兴奋剂，它在这两方面都是最有效的化合物之一。

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The major difference is that Allende is depleted in the most volatile elements, like hydrogen, carbon, oxygen, nitrogen, and the noble gases, relative to the Sun.

主要的差别是，相比于太阳，阿连德陨石缺失了大部分的挥发性元素，例如氢、碳、氧、氮和稀有气体。

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Some background: Most of the world's major currencies "float" against one another. That is, their relative values move up or down depending on market forces.

背景资料：大多数世界主要货币相互“浮动”，也就是说，这些货币的相对价值根据市场力量上下浮动。

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The report explains that over the next two decades, the relative power of major international actors will shift markedly.

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But relative to other major oil companies, did he see a bargain?

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The relative performance moved through major resistance, line b, in early January.

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