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Firstly, on the base of the strictly monotone map, we provide the definition of strictly invariant quasi-monotone map, it is the extent of the strictly monotone mapping, at the same time, it is the especial case of the invariant quasi-monotone map, too. It is supported by some examples.

在理论部分做了三方面的工作：首先，在严格拟单调映射的基础上，提出了严格不变拟单调映射，它是严格拟单调映射的推广，同时也是不变拟单调映射的特殊情况，举例加以说明。

Firstly the basic principle of OFDM and its anti-multi-path-fading are briefly introduced in this paper. Then basing on this point, we researched the basic principle, the coding designing and the algorithm of the signal detection of these MIMO-OFDM systems. At the same time, the performances of STBC-OFDM and SFBC-OFDM were analyzed and simulated under short wave circumstance, and got some useful conclusions, they have certain reference value for more research of short wave communication in future.

本文首先介绍了OFDM系统的基本原理以及它对抗多径的基本原理，然后在此基础上，对其所形成的几种MIMO-OFDM系统的基本工作原理，码字设计以及相应的信号检测算法进行了研究，详细分析研究了STBC-OFDM和SFBC-OFDM系统的性能并在短波信道下对其性能进行了仿真和对比分析，得出了有用的结论，这对以后短波通信的深入研究具有参考价值。

Firstly, according to this character, primacy central point is detected by the exploring extremum method in the windows of 3×3 pixels. Then, basing on this central point, approximate normal line at ±45°、0°and 90°angle are drew.if the minimums of normal line is at central point and the difference between the minimums and the maximum in the normal line is more than the threshold, this point is considered to the edge point of image.

首先，在3×3象素的窗口中，如果中心值为最小值，则以该点为基础，以±45°、0°和90°方向作为近似法线带，然后判断该法线上的象素最小值是否在切点上（即是否在法线的中心点上），再通过检验切点与轮廓法线上亮度极大值的差值是否超过阈值，来判断切点是否为边缘轮廓上的点。

Firstly, the most important thing is to recognize the type of battle.

首先，最重要的事情是确认战场的类型。

Firstly, the Nanjing bawdry industry changed the Nanjing residents" life custom, women"s clothing appearance as well as their overall characteristics.

南京娼妓业对社会发展的影响，首先表现在对南京市民的生活习俗、妇女的服饰打扮以及整体气质的影响上。

Firstly,we put more emphasis on:when you read in your university,you ought to be absorbed in acquiring knowledge and skills.

首先，我们更多地强调：你在读大学时应该集中精力学习你的专业知识和技能以及所有文化课。

Firstly, students will be confronted with so many psychological problems.

首先，学生面临很多心理问题。

Firstly, every blade must be tested to ensure the hardened and tempered steel characteristics.

磨出一把好胶刀是割好胶的第一关。

Until, before and during the culture revolution, the enthusiasm for politic had made the form of sculpting become a kind of artistic exaggeration in the vision of picture poster, in which there were three things accounted for the occurrence: firstly, the stylized shapes and composition formed an unitary expression; secondly, to be in 'high spirits' for politic must have an exaggerated and strengthened way of expression to suit with; thirdly, it was restricted by then economy and technology level so as to have to use plenty of cement as substitute, in which had only modeled on a big scale briefly.

及至文革前及文革时期，这种政治热情使雕塑语言发展成了一种夸张的宣传画式的视觉效果。其原因有三。

Firstly, you must be loyal to your homeland.

首先，你必须忠于你的祖国。

Objective:To compare the response control and attention of Schizophrenic patients with that of the healthy controls by Integrated Visual and Auditorycontinuous performance test. To quantitate the impairment of cognitive function in patients, and to explore the relationship between cognitive function and the severity of the disorder.

目的：探讨精神分裂症病人在IVA持续操作测试中的反应控制能力、注意力等，并与健康人进行比较，从而量化精神分裂症病人的认知功能损害，并进一步探讨其认知功能与疾病严重程度的关系。

Main effective factors including subcooling degree, mechanical vibration, gas hydrate reformation, environment temperature, noncondensing gas and surfactant are analyzed.

指出过冷度、机械振动、重复生成水合物、环境温度、不凝性气体、添加剂是影响气体水合物生成的主要因素，还对R152a水合物的放冷进行了实验研究。