中药色谱指纹图谱实际上是中药材中各种不同化学成分浓度分布的一个整体表征。

Chromatographic fingerprint of Chinese herbal medicines is in reality a general characteristic of the concentration profiles of different chemical compounds extracted from Chinese herbal medicines.

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针对赛车链条用带钢对各种力学性能的苛刻要求，通过化学成分筛选试验与工业性生产相结合的方法，设计了不同化学成分的试验钢，从中优选出合适的合金成分配比方案。

Considering the strict requirements of racing bicycle chain, the optimum composition had been selected from the tested steels, using the screen method in laboratory test combined with industrial test.

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If you could look at these cells you could find differences between them, there are chemical differences in the content of each of these cells.

如果观察这些细胞,你就能发现这些差异,每个细胞内容物的化学成分,都会有一些不同

耶鲁公开课 - 生物医学工程探索课程节选