首先

First of all, the air pollution is the most important problem.

首先，空气污染是最重要的问题。

In this paper,vehicle scheduling and allocation of related issues are reviewed in the first place.Then the air passenger free shuttle service system processes and the characteristics are analyzed.

本文以实现航空客运票务免费接送顾客的集约化服务为背景，首先对车辆调度与分配的相关问题进行了简单的综述，对航空客运票务免费接送服务系统的运作流程及特征进行了定量化的分析。

First part of this thesis introduced the key technologies and development survey of the air suspension system in domestic and overseas.At the same time ,it also elaborated the control technology of Electronic air suspension,control technology of ABS and the Joint Control Technology of both systems.

本文首先介绍了空气悬架系统的国内外发展概况和关键技术，同时也对电子空气悬架控制技术和ABS控制技术以及二者联合控制技术进行必要的阐述。

First of all, even though the airport by fighter jets, but the real organized stationed in and management of the airport is the first U.S. Air Force 316 Bomber Wing.

尽管该机场首先由战斗机使用，但真正成建制地进驻和管理该机场的却是美国空军第316轰炸机联队。

Also need to know is: If the air-conditioning units a year on the need to increase fluoride, it is first necessary to repair leakage site, and then with fluoride.

还需要了解的是：如果空调机一年就需要加氟，则首先要修理漏气部位，然后再加氟。

In this paper the dynamics characteristics are analyzed theoretically at first. According to the unique configuration and mechanics characteristics, the mechanics model and kinetic differential equation of the half-tracked air-cushion vehicle are established. Algorithm of mechanics and lifting-state parameters are put forward and analyzed. And variation ranges of the driving state parameters are obtained and the corresponding influence factors are analyzed. The further qualitative studies on control model are carried out.

因此，本文首先从理论上分析了半履带式气垫车的动力学特性，根据半履带式气垫车的独特结构和力学特性，建立了半履带式气垫车的力学模型和相应的运动微分方程，提出并分析了在纵摇与升沉运动时，半履带式气垫车的力学参数和垫升状态参数的计算方法，得到了在行驶过程中各运行状态参数的变化规律，并分析了相应的影响因素，进而对控制对象模型进行了定性研究。

It is necessary to study the mine ventilation network structure to ensure the airflow stability in mine.

本文首先对矿井通风网络方面的研究现状做了必要阐述。

At first, I will introduce the principle of the supersonic airflow tunnel and give the construction of the pipe.

首先，本文将概述超音速喷流实验台的基本原理，对整体结构的选择进行简要的说明。

First, with steady aerodynamics, this method is utilized for a two-dimensional airfoil with external store.

首先，采用简单的定常气动力，在二元机翼带外挂模型上对此方法作了验证。

Since 1980, IR stealth technology has been widely applied in the new weapons of foreign army, navy and airforce.

首先分析了红外隐身原理，然后研究了红外隐身技术的应用和发展趋势。

And discuss some key point of integrated management system design, include hazard identification and risk assessment and risk control in the occupational health and safety management, the measure of satisfaction target of customer, the flawlessness of law system, the integration of the integrated management system and enterprise standardization system, unify lead institution and work orgnization, integreted internal audit and integrated management review.

同时，论述了一体化管理体系构建中的几个主要问题，包括职业健康安全管理中的危险源辨识、风险评价和风险控制、顾客满意度的科学监测、法律、法规体系的完善、一体化管理体系与企业标准化体系的有机结合、统一的领导机构和工作机构、一体化的内部审核和管理评审。

Deepwater Taranaki is investigated for its petroleum potential, using all available seismic data tied to shallow-water wells.

运用与浅水井相关的现有全部震波探测数据考察了深海区塔拉纳基盆地的油藏前景。