第一步

The synthesis of thiourea can be divided into two steps. First, cyanamide was produced by dehydration of urea. Second, cyanamide reacted with Na_2S in water solution, which produce thiourea and NaOH.

首先第一步通过尿素常压脱水制备氰胺，第二步氰胺与硫化钠溶液在一定温度下反应生成硫脲及氢氧化钠，而氢氧化钠与通入的硫化氢气体生成硫化钠，从而继续参与反应。

The optimization of the decelerator on a wheel-side is the first and an important step toward the optimization of a loader in its driving system.

轮边减速器的优化是装载机传动系统优化的第一步，也是重要的一步。

Learning how to deal with people is the first and the most important step to enter into the society .

临摹：学会如何与人沟通是步入社会的第一步也是最重要的一步。

The preparation process of equisetum pratense total alkaloid includes the following steps: coarse pulverizing equisetum pratense to obtain rough powder, methyl alcohol percolation to obtain percolate, recovering methyl alcohol, concentrating, degreasing by means of petroleum ether, alkalifying concentrate, CHCl3 extracting, soda lye washing, neutral water washing, recovering CHCl3 to obtain rough alkaloid, adsorption by using silica gel column, eluting, recovering solvent so as to obtain refined EPR.

该发明是通过两个步骤来实现的：第一步，提取草问荆总碱，流程：草问荆粗粉――渗漉液――浓缩液(析胶、石油醚脱脂、氨水碱化)――碱化浓缩液(CHCl3萃取)――CHCl3层――CHCl3液(回收CHCl3)――粗生物碱――吸附硅胶柱――精致EPR。第二步，选择实验试剂、仪器、用小鼠作为实验对象，进行中枢神经系统实验，研究作用及作用机制。

By the procedure, we first use the cosine values of the angle between view vector and normal vector on each vertex as the texture coordinates, through calculation of the dot product of the two vectors. The derivative of radial curvature on the model surface is used as the second pass texture mapping coordinates, by a calculation using Euler formula.

该方法首先通过模型顶点的视线向量和法线向量的点乘积计算其夹角的余弦值，作为第一步的纹理坐标进行映射；再通过欧拉公式计算径向曲率及其方向导数值，作为第二步映射的纹理坐标。

Additional comments by the four state politicians led us to believe there might be a second step, following Heaton's remark about the enrichment facility being the first step.

更多的评论是由四个国家的政界人士，使我们不得不相信这可能是第二步，德恩以下的一句话就浓缩设施的第一步。

The first step is to adopt the devised method as to learn which hexagram is predestined for the incident.

第一步是依既定的程序求卦；第二步是按筮书上的文字；即卦辞和爻辞来解释该卦的启示。

We start with the alphabet, whether it's English or Hindi or whatever.

这是在修习佛法的前进阶段中的第一步，也是最重要的一步。

Payment to the Group General Manager of Shanghai Zhaohanzhong revealed in an interview with a group of East China more development strategy : the first step in Shanghai to buy a brand that 140 hectares; The second step, with Shanghai as center of a circle, 2 hour radius of the medium and small cities as economic circles expansion, 2005, the Shanghai company's performance will be the biggest profit growth as a whole group.

金地集团上海公司总经理赵汉忠在接受记者采访时更透露了集团的华东发展策略：第一步，在上海做好这140公顷的大盘打品牌；第二步，在以上海为圆心、2小时车程为半径的中小城市经济圈内扩张，2005年以后，上海公司的业绩将成为整个集团最大的利润增长点。

Imitation is the first and the most important step to study english.

模仿是学习英语第一步也是最重要的一步。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了