But proving this has been difficult because snatching a sample of the Mona Lisa's face for chemical analysis is, unsurprisingly, frowned upon.
但要证明这一观点则十分困难，因为要刮下一小块蒙娜丽莎的脸作为化学分析样本是无论如何都不可能得到允许的。
Supercritical fluid extraction as a sample preparation tool for harmful chemical residue analysis in analytical toxicology are reviewed.
综述了超临界萃取作为样品制备技术在痕量药检分析中的应用。
Attenuated total reflection infrared spectroscopy (ATR) is a useful tool for surface analysis providing structural and chemical information about the sample.
衰减全反射红外光谱技术是表层结构分析的有利手段。
应用推荐