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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Various proposals were put forth to arrange the elements into groups based on similarities in chemical and physical properties.

人们提出了各种建议，根据化学和物理性质的相似性把这些元素分组。

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The isotopes of a given element have the same chemical properties but slightly different physical properties.

一个特定元素的同位素具有相同的化学特征，但在物理性质上有一些细微差异。

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Last July,the Food and Drug Administration advised manufacturers to add what are called physical chemical identifiers to their medicines.

VOA: special.2010.03.01

We talked about the structure of DNA, how it works in terms of a physical chemical model of the DNA molecules.

上节课我们讲了DNA的结构,从理化模型的角度讲了,DNA分子是如何工作的

耶鲁公开课 - 生物医学工程探索课程节选

Most chemical changes, most physical changes don't happen in isolated systems.

但是大部分的化学反应,并不是发生在孤立系统中的。

麻省理工公开课 - 热力学与动力学课程节选

The stem cells were given physical or chemical cues to create the desired type, Green said.

CNN: Lab-made organ implanted for first time

Katie Daniel, deputy editor of the journal Physical Chemistry Chemical Physics, said the finding was important.

BBC: Evidence on mobile phone health risks is inconclusive

Down at these near-atomic sizes, materials exhibit unique properties that dramatically alter their physical, chemical or biological behaviour.

ECONOMIST: The dulling of nanotech��s silver lining