首先

First of all, he told me, I couldnt write what other people had said without acknowledging them.

他告诉我说，首先，我不能把别人的话写下来而不表示感谢。

Let me be clear, he said, and went on, first acknowledging the obvious

我要明确指出，他说，接着，首先承认既成事实

First you need to do a little research and determine what kind of acne you have and what causes it.

首先，你需要做一个小小的研究，确定什么样的痤疮你的原因又是什么。

To work the acoustic coupler, start the computer's communications program, dial the distant computer on a single line telephone with a normal e.g.

使用声音耦合器时，首先启动计算机通信程序，然后再拨打远端计算机。

First of all, I have two acoustics.

首先，我有两个音响效果。

First, I have two acoustics.

首先，我有两个音响。

First,I have two acoustics.

首先，我有两个音响效果。

Chapter 1 is the acquaintanceship of the Principle of debate This chapter is composed of four sects.

第一章辩论主义的认识——辩论主义的理论导入本章共分为四部分内容：首先，探究辩论主义的渊源；其次，分析辩论主义的概念。

The reaction process in methanol solvent can be deduced from the computational results with CPCM solvent model and the supermolecular handling, namely the reaction involves four steps in the methanol solvent. The nucleophilic addition of trimethylamine to acraldehyde generates an enolate. Nucleophilic attack of the enolate on the aldehyde forms the carbon-carbon bond, followed by the proton-transfer process and the further elimination generating the product and liberating the trimethylamine catalyst.

对于CH3OH对反应体系的影响，可以综合考虑CPCM溶剂模型及超分子模型下的研究结果，即CH3OH溶剂中反应按四步进行，催化剂三甲胺首先与丙烯醛发生亲核加成，生成的两性离子中间体与甲醛发生类似于Aldol的醛醇缩合，形成碳-碳键，之后发生分子内质子转移，最后经E1cb消除得到产物，并释放催化剂三甲胺。

Fertilization is a complicated biological process, during which spermatozoa must undergo proper changes in their structure and function to finish capacitation and acrosome reaction.

受精是一个复杂的生物学过程。在这一过程中精子首先必须经过复杂的结构和功能改变，完成获能和顶体反应。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷