Any type of solid or semi solid organic material of natural or synthetic origin, generally of high molecular weight with no defined melting point. Most resins are polymers.

一类固体或半固体的天然的或合成的有机材料，一般为无清晰熔点的高分子量材料，多数树脂为聚合物。

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Low molecular weight compounds of coal is generally defined as those organic compounds with MW below 500 destributing in skeleton structure of coal macromolecular material.

煤中的低分子化合物一般是指分散于煤的高分子主体结构中的分子量小于500的有机化合物。

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BPA is an important organic chemical material, is mainly used to produce various high molecular materials.

BPA是重要的有机化工原料，主要用于制造多种高分子材料。

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By bombarding the fossils with an infrared synchrotron beam a noninvasive way of analyzing a material's internal chemistry the scientists said they detected molecular traces of an organic protein inside the mineralized bones.

WSJ: Dinosaur Embryos Point to Rapid Growth