This paper introduced a low yellowing , excellent flame retardant unsaturated polyester resin synthetized from a special chemical structure brominated compound and its chemical physical properties.

采用一种特殊化学结构的含溴化合物为主要原料， 合成了一种具有老化变黄度小、 阻燃性能优越的不饱和聚酯树脂，介绍了此树脂的化学物理性能。

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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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Both chemists were sufficiently farsighted to leave gaps where their analyses of periodic physical and chemical properties indicated that new elements should be located.

这两位化学家都非常有远见，他们对周期性的物理性质和化学性质进行分析，并在预示应该出现新元素的地方留下了空位。

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They also will study chemical and physical properties of the soil samples with a method called infrared spectroscopy.

VOA: special.2009.01.20

"We can try to find out the chemical and physical properties of the disk that causes a planet to form there, " said Dr. Quanz.

WSJ: Possible New Planet Spotted Under Formation

Specifically, unexpected physical, biological, and chemical properties emerge that are not present in the same materials at larger scales.

WHITEHOUSE: Office of Science and Technology Policy Blog

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