首先

First of all, our generic abstract class must be implemented.

首先，我们的通用抽象类必须得到执行。

Actually he did a great job in the area, and made him a leading artistic of the movement called abstract expressionism.

l 考生将首先听到历时60到90秒，大约在180到220字的一段听力内容。

If the number of sub-tree of XML is more and more, the value must be replaced by the abstracter conception.

使用概念层次树的基本思想是：首先，一个属性的较具体的值被该属性和概念层次树中的父概念所代替；然后，对XML中出现的相同子树进行合并，如果XML中生成的子树数目仍然很大，那么用这个属性的概念层次树中更一般的父概念去替代。

But in the process of performing, there exists some problems both abstractly and practically, waiting to be solved.

论文首先阐述了教育研究对中小学教师的意义，然后对苏州市某中学的教育科研状况进行了调查和分析。

By analyzing the spatial relations of urban road network, the abuttal relation between road sections is discussed.(2) By analyzing the cognition process for sign information, the design method based on spatial reasoning is established.

首先对城市道路网的空间关系进行了分析，明确了路段邻接关系的表达；然后通过对标志信息的认知分析，探讨了基于空间推理的道路信息标示设计方法，最后对方法的具体实现进行了说明。3、基于标志性地物的指路标志设计方法研究。

Let us first look at the present abysmally horrifying hospital environment that our patients have to endure.

首先让我们看看病人在医院里所须忍受如炼狱般的环境。

The Book of Enoch was first discovered in Abyssinia in the year 1773 by a Scottish explorer named James Bruce. In 1821 The Book of Enoch was translated by Richard Laurence and published in a number of successive editions, culminating in the 1883 edition.

以诺书首先在1773年被一位叫詹姆斯布鲁斯的苏格兰探险家发现于阿比西尼亚。1821年，以诺书被理查德劳伦斯翻译，出版了数个连续的版本，最后的是1883年的版本。

The results are presented and compared with the available results of other authors, which shows satisfying agreement. And a submerged body beneath the free surface in accelerated motion is considered; the numerical results of instant wave resistance and free surface elevation are presented and discussed.

对非定常线性兴波问题的求解，第5章作为算法的验证，从较简单的近自由面运动潜体的非定常兴波问题入手，首先对无限水深近自由面潜体突然加速和渐近加速的非定常兴波问题作了计算，给出了非定常兴波波形和非定常兴波阻力随时间的变化曲线，计算结果与其它文献给出的结果进行了比较，其吻合程度令人满意。

Firstly, the structure of the accelerometer is designed.

首先，对三明治结构加速度传感器进行了整体设计。

Then,based on the gap acceptance theory and probability method,the capacity calculating method of minor stream is deduced on the condition of two vehicle streams,and theory model ...

首先分析了交叉口车流的运行特点；然后基于可插车间隙理论和概率论方法，给出两股车流情况下次路车流通行能力的计算方法，并对主路车流车头时距服从M3分布次路车流的理论模型进行了推导；最后对整个交叉口的"冲突交通流-临界间隙法"进行了分析。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。