查询词典 substituted

An intramolecular α-addition of hydroxy or amine-substituted electron-deficient alkyns catalyzed by phosphines was developed.

主要工作是利用我们小组发现的全碳1，3-偶极子在合成螺环化合物方面做了比较细致和深入的研究。

An intramolecular α-addition of hydroxy or amine-substituted electron-deficient alkyns catalyzed by phosphines was developed. An intramolecular β-addition of hydroxysubstituted 2-alkynoates trigged by the tributylphosphine was also achieved.

在上面的研究中发现低活性的亚甲基取代的环内酰胺的[3+2]环加成反应也能顺利进行，因此我们研究并实现了β-位取代的贫电子烯烃的环加成反应，进一步拓展了叔膦催化的[3+2]环加成反应。

Objective:To explore antioxidant activity of the different substituted phenols.

目的：研究不同取代苯酚类化合物的抗氧化活性。

The results showed that the toxicity of substituted phenols was mostly determined by molecular chemical activity and the stability of molecular structure.

结果表明，取代苯酚类化合物毒性的大小主要取决于分子的化学活性和分子结构的稳定性。

No physician should ever begin rounds without a stethoscope and penlight in his coat pocket. Although he may not always carry a tongue blade, chopsticks or a teaspoon could be substituted for the oropharyngeal exam.

任何一个医生在开始查房时至少要有听诊器和笔式电筒，也许他不一定总带着压舌板，但可以设法用筷子或勺子等代替进行口咽部的检查。

With its characteristic of non-contact、large scale and high precision, it can not be substituted by other contact methods for some special objects and applied fields.

由于视觉测量方法的非接触、大量程和高精度的特点，对一些特殊测量对象和某些生产现场是其它接触式测量方法无法替代的。

I couldn't quite work out if it was because Oba Martins was being substituted, or whether it was a section of the ground having a go at Owen because he wanted a warm up before playing the full 90 minutes for England.

如果马丁斯被代替，我一定没办法控制自已的情绪，或许欧文这么努力有一部分原因是为了在回国家队之前能做好充分的准备。

We call it "tree", and this word becomes the exclusive sign of the class "tree"; it evokes the image of the individual objects of that class as the perception of every one of these evokes the image of the sign substituted for the whole class.

我们称之为&树&，这个词成为独家的迹象，一流的&树&，它使人的形象，个别物件的阶层的看法，每一个这些使人的形象标志取代整个类。

Now, it is substituted by accumulations of quasi-public substance that, while suggesting welcome, actually make you pay.

而现在有越来越多的&类公共&，表现出它们欢迎您使用，而实际上是要赚你的钱。

The stick figure is quick and vivid, it is a kind of positive method in primary English classroom which cannot be substituted, the teacher can utilize this method while teaching, it is both actual and situation , audio-visual combination of vividly specific, the concept is clear and it can be revised if there is a necessity.

简笔画快而生动，它是英语课堂教学的一种不可取代的积极手段，运用时边讲边画，虚实并举，视听结合，生动具体，概念清楚，还有可以随时修改的特点，是学生喜闻乐见的教学形式。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。