In the process of formation, the material must have received an environmental signal that reflects a change in climate and that can be deciphered by modern physical or chemical means.

在形成的过程中，材料必须接收到环境信号，反映气候变化，并能被现代物理或化学手段破译。

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If a change does not affect the food's chemical composition, we call it a physical change.

如果一种变化不影响食物的化学成分，那我们便称之为物理变化。

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Some, including Dr Riebesell, suspect that these physical and chemical effects of warming may prove a greater driver of productivity change in the ocean than altered ph.

包括Riebesell博士在内的一些人士怀疑暖化带来的物理和化学因素对海洋里生产力的影响可能超过改变了的PH值。

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