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"Rare in nature, olefins are obtained by the cracking of petroleum fractions at high temperatures. The simplest ones (ethylene, propylene, butylene, butadiene, and isoprene) are the basis of the petrochemicals industry."

烯烃在自然界很稀少，但在石油裂解成汽油过程中可大量生成，低级的单烯烃已成为庞大的石油化学工业的基础。

The Hong Kong Time Standard is provided by a caesium beam atomicclock. Accuracy within fractions of a microsecond a day is maintained.

天文台利用铯原子钟，提供香港的时间标准，该钟误差每日不超过一微秒。

By using the method of Western blot on fractions of nuclear and cytosol of primary cultured mantle cells and immunogold electron microscopy, we found out the completely different localization of these two proteins: CaM was localized both in cytoplasm and nuclear but CaLP was localized only in the cytoplasm.

通过对体外培养的珍珠贝外套膜上皮细胞核质分离后进行的Western blot分析和免疫电镜研究发现，CaM和CaLP的亚细胞定位是截然不同的：CaM分布于外套膜上皮细胞的细胞核与细胞质中，而CaLP却仅分布于外套膜上皮细胞的细胞质中。

1 M packed with Mellapak SM-250 under vacuum in batch process to obtain fractions rich in such components as pinenes, camphene, limonene as well as p-cymene, terpenol s, respectively.

松轻油先用碱液进行预处理，再用工业SM-250型孔板波纹填料塔(300mm、高10.1m)，以真空间歇操作方式进行一次性精馏分离，分别得到富含蒎烯、莰烯、苧烯及对-伞花烃、萜烯醇等的馏分。

You will obtain infrared spectra of the carvone and limonene fractions and interpret the results.

你将得到香芹酮和柠檬烯馏份的红外光谱图。并且要解析其结果。

Run infrared spectra of the lim onene and carvone fractions obtained by distillation.

红外卡的盐窗上加入几滴的液体作红外分析。

Plug in your data and determine the value of xcarvone for the limonene and carvone distillation fractions and the oil itself. Compare these results with those obtained by GC.

把你的数据组合起来，然后确定在柠檬烯，香芹酮馏份和油本身的xcarvone的值，将这些数据和气相色层分析的数据比较一下。

From the gas chromatography, report the percentages of limonene and carvone in your original sample and in the fractions following distillation.

从气相色层析分析中，回报在你的原样品和通过蒸馏所得的馏份中所含柠檬烯和香芹酮的百分含量。用蒸馏法分离这些组份的效率有多高呢？

Save a small portion (5 drops) of your original essential oil sample and of the distilled limonene and carvone fractions for Gas Chromatography and Refractive Indexes measurements.

留下一小部份(5滴)的原精油样品和蒸馏过的柠檬烯和香芹酮馏份，作为气相色层分析和折光率的测定用。

DAY 1: Distillation and Gas Chromatography: WORK in PAIRS. Split evently the limonene and carvone fractions for the derivatization step.

第一天：蒸馏和气相色层分析：以对为单位工作，一组分一个柠檬烯一组分一个香芹酮馏份作为衍生化步骤

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。