首先

In the process of formulating T-matrix, a characteristic of axisymmetric particle is found which is the independency of azimuthal mode m.

首先给出了光散射计算中的 T 矩阵方法的推导过程，然后分析了轴对称粒子 T 矩阵的特点―方位模 m 的独立性。

We summarize the development, potential application and some problems of nonlinear optics. The nonlinear properties and spectroscopic characteristics of two azobenzene guest-host polymers are investigated.

本文首先综述了有机化合物非线性光学效应的研究进展和非线性光学材料的应用前景，阐明了这些领域某些需要解决的问题。

First, baby boomer generation is aging and they think that their competitiveness will increase if they look good.

首先，婴儿潮时代已经远去而且他们认为要有竞争力就必须令自己变得好看一点。

Special occasion attire like baby's coming home outfit, first Christmas, and Baptism can be saved in a special place for passing on to a next generation.

特别的场合，衣着一样，婴儿的未来家居装备，首先在圣诞节，和洗礼，可以保存在一个特殊的地方，通过对一个下一代。

First,my plan is to pay for her a great-grand number of pretty baby skirts and pink hairpins till she becomes a little dreamy princess.

我的计划是：首先，给她买许多漂亮的娃娃裙和粉红色的发夹，将她打扮成一位梦幻小公主。

First of all, we will now Bach to sum up the meaning of Leipzig, which is very fascinating.

首先，我们现在将巴赫对莱比锡的意义总结出来，这是非常令人着迷的。

The thesis first probably explains BrushLess Direct Current Motor, and discusses the related control methods, explains the background and Meaning of back electromotive force which is used in the thesis.

本文首先对无刷直流电机进行了概述，并对其相关控制方法进行了讨论，说明本文所采用反电动势法的背景和意义；接着论述了无刷直流电机基本组成环节、基本工作原理、运行特性和传递函数，然后是详述本文研究的重点：基于反电动势法的MATLAB调速系统的仿真以及基于反电动势法的DSP控制系统的实现。

The thesis first probably explains BrushLess Direct Current Motor, and discusses the related control methods, explains the background and Meaning of back electromotive force which is used in the thesis.Then the thesis expounds the basic component parts,the basic running principle,the running characteristic and transfer function of the BLDCM.And then the thesis detailedly dissertates its research pivot: the simulation of BLDCM system in MATLAB based on the method of Back-EMF and the control system of Digital Signal Processor based on the method of Back-EMF.

本文首先对无刷直流电机进行了概述，并对其相关控制方法进行了讨论，说明本文所采用反电动势法的背景和意义；接着论述了无刷直流电机基本组成环节、基本工作原理、运行特性和传递函数，然后是详述本文研究的重点：基于反电动势法的MATLAB调速系统的仿真以及基于反电动势法的DSP控制系统的实现。

But first, I had to go back by myself and end my marriage.

但首先，我得先回来结束我的婚姻。

First, there is a solar panel on its back which means you can charge it by exposing in the strong sunshine.

首先，它有一个回收费，这意味着你可以通过暴露在强阳光下它的太阳能电池板。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。