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Firstly, we consider SIQR epidemical models with continuous and pulse vaccinations; the reproduction numbers have been obtained for those models; by using Dulac function, we prove the global stabilities of equilibrium of SIQR model with continuous vaccination. In the SIQR epidemical models with pulse vaccinations, we have also discussed the existence of the infection-free periodic solution, the global stabilities of the infection-free periodic solutions, and the effectiveness of pulse vaccination and continuous vaccination policies has been compared for the two models.

文中首先考虑具有连续免疫接种和脉冲免疫接种的SIQR传染病模型，分别获得了它们各自的基本再生数；利用Dulac函数方法证明了具有连续免疫接种的SIQR模型无病平衡点的全局渐近稳定性；在脉冲免疫接种下SIQR传染病模型里，讨论了无病周期解的存在性，证明了该周期解的全局渐近稳定性，并且对连续和脉冲接种下的SIQR传染病模型的接种效率进行了比较。

Therefore, this paper firstly gives a systematic overview of domestic and overseas dust storm researches and presents the goals and the framework of this thesis.

鉴于此，论文首先对国内外沙尘暴研究进展进行了系统的回顾和归纳，提出了论文的研究内容和目标。

While in the Red Mansion, the most beautiful dress comes firstly to the dustcoat .

在《红楼梦》中，写得最美的服装，当首推风雨衣。

The supervisory institution, as the main executor of banking supervision, firstly, the key for them is to improve the level of supervisors and ensure them duteous by effective administration and incentive-discipline mechanism; secondly, the effective way is to sound supervision information and take the corresponding measures according to the risk grade of bank; thirdly, the base is to enforce the personnel supervision and implement supervision strictly according to laws.

监管机构作为监管的主要实施者，一要提高监管人员的监管水平，并通过有效的管理与激励约束保证其尽职监管，这是监管的关键；二要完善监管信息，依据银行机构风险等级采取相应的监管措施，这是监管的有效手段；三要加强人本监管，严格实行依法监管，这是监管的根本。

Firstly, he must be a dutiful son.

首先，他必须是一位孝子。

In this paper, the OMT based modeling method is investigated firstly. Then, the object mode, function mode and dynamic mode are built, which lays a solid foundations for the automatic generation of dyn...

本文首先研究了对象建模的方法，并以之为指导，建立了FMS的对象模型、功能模型和动态模型，为FMS动态仿真软件的自动生成打下了基础。

Firstly, we give the geometric interpretation of the scheme.Secondly, we use the method developed in Dyn's original four-point paper to discuss the sufficient conditions for the limit curve to be C0,C1,C2 respectively.

首先给出了算法的几何意义，然后我们用Dyn在1987年发表的四点法中使用的办法，详细讨论了极限曲线连续，一阶连续，二阶连续的充分条件。

Firstly, this thesis introduces not only history of development, mode of operation of overseas and domestic power market but also Chinese power market coming into being and characteristic of current market structure. And that analyzed basic bidding ways of dynamoelectric side.

首先，结合国外以及国内电力市场发展的历史，介绍了电力市场的基本模式，对我国电力市场的形成和现行的电力市场结构的特点进行了介绍；对电力市场发电侧的报价方法进行了简要分析。

Based on analyzing relevant documents and investigation of dynamoelectric enterprises, firstly the paper reviews the development of performance core competence theories home and sea.

中文摘要：本文在查阅大量相关文献和对发电企业实地调研的基础上，首先回顾了企业核心竞争能力理论的发展与演变过程。

Firstly, the pulse source of middle- and far-range is deeply studied. The influential factors on the stability index of a pulse source are minutely analyzed, and full-solid and high-stability pulse source units, based on avalanche dynatron, are designed.

通过电路合成和空间合成两种方式进行脉冲源单元的功率和重复频率的相干合成，研制出高功率、高重频脉冲源，为实现超宽带冲激雷达的中远程目标探测提供了前提条件。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。