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Pyrrole derivatives are abundant as constituents of natural products and have broad synthetic utility in both material science and medicine.

吡咯衍生物是天然产物的常见构成组，在材料科学及药物上有着广阔的应用价值。

From radioactive equilibrium of natural radioactive decay series and content of several radioactive constituents, the formula for estimating activity of uranium ore and solid waste is derived and a case study on treatment engineering of decommissioning Linchang Uranium Mine is presented.

文摘：根据天然放射性衰变系列的平衡关系，推出了通过若干个而非全部放射性组分的监测数据来计算铀矿石和固体废弃物中放射性活度的公式，给出了临沧铀矿退役治理工程的估算实例。

To organic cell constituents is a reductive process .

肿0化为有机的细胞成分是还原过程。

In context, US politicians must address issues relative to their respective constituents' perception of progress.

在上下文中，美国政治家对他们各自组分进步的观点需要发表演说。

Food packaging mainly consists of plastic bags, paper bags, aluminum foil bag, forcarbonated, oftinned ceramic bottles, cans, plastic film, and so on to the inner packaging and materials, as well as packs made of cardboard, plastic bins, requitement, etc and materials, these wrappers hazardous constituents is the effect of food quality, superstandard humans.

食品包装主要包括塑料袋、纸袋、铝箔袋、玻璃瓶、陶瓷瓶、马口铁罐、塑料薄膜等内包装及材料，以及纸箱、塑料桶、钢桶等外包装及材料，这些包装材料中的有害成分都可能因为超标影响食品质量，损害人体健康。

Objective: To study the chemical constituents of the volatile oil from the rhizome of Anemarrhena asphodeloides .

中文摘要：目的：研究知母挥发油的化学成分。

AIM: To study the chemical constituents of the aerial parts of Rhododendron primulaeflorum Bur. et Franch.

目的：研究樱草杜鹃的干燥地上部分的化学成分。

Objective To investigate the chemical constituents in Embelia ribes.

目的 研究白花酸藤果中的化学成分。

On the basis of the results gained in chapter 2, abiotic syntheses of nucleotides from their constituents (including bases, ribose or deoxyribose and phosphates) were studied by low energy ion implanting into aqueous solution.

在第二章的基础上，第三章研究了离子注入核苷酸组分（碱基、核糖或脱氧核糖、磷酸盐等）水溶液诱发的核苷酸的合成反应。

Objective To study on qualitative and quantitative methods for the main active constituents of acanthopanax senticosus by TLC and HPLC and compare the quality of stem with the quality of root and rootstalk.

目的采用薄层色谱法和高效液相色谱法对市售刺五加根、根茎、及茎中主要活性成分进行定性定量研究，比较刺五加根、根茎、及茎的质量。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。