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P-nitrophenoxy ethanol is synthesized with p-nitrophenol and chlorohydrin in the presence of water solution of KOH,with better quality and high yield of the product,and with much lower costs over the reported methods.

以对硝基苯酚和氯乙醇为原料，在KOH的水溶液中进行反应，以较高收率合成了对硝基苯氧乙醇，此方法成本低、纯度高，同时考察了多种因素对产率影响。

In other words, silicon powder and chloromethane are converted into a mixture of methyl chlorosilane in the presence of catalyst under pressure and heat, and then the intended fraction is separated by efficient fractionation.

产品主要以有机硅单体为原料，采用不同的聚合手段和工艺，添加各种填料和助剂制得。

Sugar is built up from carbon dioxide and water by the energy of sunlight in the presence of chlorophyll.

糖是在叶绿素参与下，由二氧化碳和水通过太阳光能构成的。

This is basically well known polymerization techniques such as copolymerizing chloroprene with a methacrylate in the presence of an organo-aluminum compound.

这基本上是众所周知的，如共聚同在一个有机的存在氯丁铝复合丙烯酸聚合技术。

The influence of added methyl acrylate on the emulsion copolymerization of methacrylic acid and chloroprene in the presence of polyvinyl alcohol as a protective colloid was investigated.

研究了丙烯酸甲酯对聚乙烯醇为乳化剂的氯丁二烯和甲基丙烯酸乳液共聚合的影响。

Heretofore she had never bothered to control her temper except in Ellen's presence. Now it was painful to have to choke back words for fear of his amused grin.

在这以前，她是从来不控制自己的感情的，除非在母亲跟前，可如今为了避免他那得意的咧嘴冷笑，使不得不忍痛把已到嘴边的话也憋了回去。

One is the strong presence of the neo-classical Christian Science Church.

其一是强大的存在的新古典基督教科学会。

At Christmastime we often say,"God's presence is more important than presents."

在圣诞节我们常说：「上帝的同在比任何礼物更重要！

As a result of adsorption effect of active carbon, the efficiency of chromate removal by iron chips enhanced by the presence of active carbon.

活性炭存在下亦能促进废铁屑对Cr的去除，这主要是由于活性炭的吸附作用所致。

Its green color is due to the presence of chromium.

它的绿色是由于铬的存在。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。