因此，它们在性质上的唯一区别应该可通过观测两种香芹酮的气味和旋光仪中旋光度的符号而得知。

Hence, the only difference in properties one should observe for the two carvones are the odors and the signs of rotation in a polarimeter.

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而冷冻干燥的疫苗则在置入微针模子前与乙烯基吡咯烷酮单体混合、并在室温下用紫外光将混合物聚合。

Freeze-dried vaccine was mixed with the vinyl-pyrrolidone monomer before being placed into microneedle molds and polymerized at room temperature using ultraviolet light.

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薄荷醇和薄荷酮含量的测定方法有旋光测定法、折光指数法及乙酰化法。

There are some other ways to analyzed the contents of menthol and menthone, such as polarimetry, refraction index method and acetylation method.

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