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This yields values of zero for a racemate and 100 percent for a pure enantiomer.

对于消旋物来说，该值为0，若为纯的光学异构体，则为100%。

Iodine was found to be an efficient catalyst for the imino Diels-Alder reaction of N -arylimine with enol ethers to provide tetrahydroquinolines in good yields.

发现碘能够有效地催化N－芳基亚胺和烯醇醚之间的亚胺Diels-Alder反应，以较高的产率得到四氢喹啉衍生物。

One pot synthesis of tetrahydroquinolines from aldehyde, aniline and enol ethers catalyzed by iodine was also applicable and provided tetrahydroquinolines in comparable yields.

在碘的催化下，从醛、苯胺和烯醇醚出发"一锅"合成了四氢喹啉衍生物，反应的产率与使用预制的亚胺进行的反应基本相同。

In addition, ioding was found to be an efficient catalyst for the imino Diels-Alder reaction of N-arylimine and enol ethers and the reaction provided tertrahydroqinolines in good yields. One pot synthesis of tetrahydroqinolines from aldehyde, aniline and enol ethers was also achieved using iodine as the catalyst. The chemical yield of the"one pot"reaction was comparable with that obtained using preformed N-arylimine.

此外我们也发现碘能够有效地催化N-芳基亚胺与烯醇醚的Diels-Alder反应，以很高的化学收率得到了四氢喹啉衍生物，并且发现碘也能够直接催化芳香醛、苯胺、烯醇醚的三组分"一锅"反应，获得的化学产率与使用预制的N-芳基亚胺相当。

Remarkable changes are ubiquitous for NSO fractions and asphaltene. The yields of fatty acids from copper-treated EOM, in particular palmitic acid and stearic acid, do not decrease for the interaction of copper with organic acids but increase markedly.

加铜得到的可溶有机质脂肪酸的含量不仅没有因为铜和脂肪酸的作用而减少，反而大幅度增加，尤其是氯仿沥青中的脂肪酸，甲醇沥青中的脂肪酸增幅较小。

Geochemical identification supporting with cluster analysis method yields the divisionof eruptive stages and 3 cycles including 6 times.

地化鉴定结合聚类分析方法得出该区火山喷发可划分为 3 期6 次。

Ethanolamine derivatives were aliphatic compounds, so the yields of cantharidinimide derivatives were only influenced by steric hindrance effect.

在与ethanolamine的衍生物反应时，因为ethanolamine是一个直链的化合物，所以产率只受到立体障碍的影响，当立体障碍越大时，产率也就越低。

When farmers have exhausted all virgin forest on their land they begin to cultivate dryland rice in the bush-fallow Once they are cultivating in bush-fallow, increasing weed populations and declining yields result in an ever-shortening fallow period until a time is reached when it is no longer worthwhile for the farmer to continue.

当农民已经用尽了所有的原始森林在自己的土地，他们开始培养在丛林中，休耕（barbecho一旦他们在丛林休耕培养）陆稻，增加在日益缩短休耕期的时间，直到杂草种群和产量下降的结果到达时，它不再是值得农民继续。

Evergreen oak of southern Europe having leaves somewhat resembling those of holly; yields a hard wood.

欧洲南部的一种常绿栎树，叶似冬青；生产坚硬木材。

Evergreen oak of the Pacific coast area having large leathery leaves; yields tanbark.

太平洋沿岸的一种常绿栎树的一种，叶大，皮质；生产鞣料树皮。

Sodium citrate; calcium carbonate; calcium hydroxide; potassium bicorbonate; magnesium carbonate; ferrous sulphate; Zinc sulphate; copper sulphate; manganese sulphate; potassium iodide; sodium selenite.

柠檬酸钠；碳酸钙；氢氧化钙；碳酸氢钾；碳酸镁；硫酸亚铁；硫酸锌；硫酸铜；硫酸锰；碘化钾；亚硒酸钠。

All this to say that I'm glad filmmaking hasn't become completely ironic. I can enjoy an ironic film as much as the next person, but they usually involve a message of some sort. One that's delivered in a smirkingly clever way that requires little in the way of talent.

所有这些都是说，我很高兴电影制作没有变成完全讽刺艺术，我可以和下一个人一样享受讽刺电影的乐趣，虽然他们经常会被划归到一定级别，技术方面不需要很高的才能。