Chemical composition of tobacco is very complicated, though more than 4,000 of components have been identified.
烟草的化学成分十分复杂，已鉴定出的成分就有4,000多种。
With these spectral methods, the chemical composition and the structure of the polishing paste for plastics were identified.
通过上述光谱法确定了该塑料抛光膏的化学组成和结构。
Chemical Composition More than 180 compounds have been identified in propolis, and many are biologically active.
蜂胶中含有超过180种化学成分，大多数是具有生物活性的成分。
A layer composed of the particle-size composition of characters and symbols is spread on the external surface of the upper margin, used as identified markers.
一层组成的颗粒粒度组成的字符和符号传播，对外部表面的上缘，用来作为识别标记。
The fatty acids composition of seed oil were separated and identified by GC-MS.
采用气相色谱-质谱（GC-MS）联用技术对橘核脂肪酸组成进行了分析和鉴定。
Firstly, they were identified by authors as ultra microfossils instead of ultra microbes based on their morphology, structure and elemental composition.
首先，它们是笔者根据形态、结构和元素成分作为超微生物化石进行鉴定的。
The chemical composition of the largest spot on thin layer plate was identified by Infrared spectrum, and its content was determined by TLC scanning.
挥发大蒜油在薄层板上分离出的最大斑点的化学成分用红外光谱法定性，用薄层扫描法定量。
Methods: The chemical composition of the pigment from gingko seed was identified as carotenoid by UV absorption spectrum.
方法：可见光吸收光谱特性分析证实白果中色素成分为类胡萝卜素；
The composition and content of soluble sugar. aminoacid, tannin. organic acid and other compound were determined and identified.
分析测定了枯枝落叶中的可溶性糖、氨基酸、单宁、有机酸及其它化合物的组成及含量。
The structure and composition of the copolymer were identified and examined by infrared spectrogram and NMR-H spectrum.
通过红外光谱、核磁共振氢谱明确了聚合物的组成和结构。
The microstructure, composition and phases of the alloy were analyzed by SEM and EDS. The icosahedral quasicrystal structure was identified by TEM.
通过扫描电镜、能谱分析仪和透射电子显微分析技术，确定了合金的凝固组织、相成分及二十面体准晶的结构。
Soil grain composition, soil carbon and soil nitrogen were identified as the most important factors in shaping nematode communities.
土壤颗粒组成、碳含量和氮含量是影响线虫群落结构的主要环境因子。
To provide proof of grafting, modified hydrolysate was identified by indanthrone, the IR and amino acid composition analysis of hydrolysate and modified hydrolysate were studied.
对改性产品以茚三酮法进行分析，对铬鞣革屑水解产物及其改性产品进行IR分析和氨基酸分析。
To provide proof of grafting, modified hydrolysate was identified by indanthrone, the IR and amino acid composition analysis of hydrolysate and modified hydrolysate were studied.
对改性产品以茚三酮法进行分析，对铬鞣革屑水解产物及其改性产品进行IR分析和氨基酸分析。
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