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Objective: To determine and analyze the etiologies and modalities of treatment for unconsummated coitus due to vaginal penetration failure.

目的：找寻并分析原发性阴道插入失败，导致性交未完成的原因，以及治疗的模式。

Usually generator collector ring having fever is due to the destruction of the surface oxide film and mechanical friction. This paper analyzed the reasons for it and put forward the treatment method.

发电机集电环发热大多是由于表面氧化膜被破坏且无法重新建立，以及机械摩擦等原因造成的，本文对这些原因进行了分析，并对其处理方法进行了探讨。

As the coloratura mezzo-soprano singers, it is difficult for them to perform the coloratura skill due to its modernity, its overwhelming presentation and its comprehensive and extraordinary development.

花腔作为美声唱法传统技能技巧具有一定的美学原则和艺术思想，女中音能够演唱花腔技术是很难得，她不仅是美声唱法的追求和特点，更是女中音声部想要全能全面发挥所要具备的歌唱技能技巧。

Some of them are hoodwinked for the moment, but they may come to their senses in due course.

有些虽然一时受了蒙蔽，但时机一到，他们还有觉悟的可能。

The variation of commensal rodents' community structure in Suzhou was due to the rodents' habitat destroyed for municipal construction and the human's intervention.

结论城市环境改造和人为干预活动，改变了鼠类栖息的生态环境和栖息场所，家栖鼠的群落结构也发生了相应变化。

This was due to such circumstances as the need for a strong leader in times of persecution and in the controversies against heretics and perhaps also to the prestige attaching to the minister who regularly conducted the service of Holy Communion.

这是由於有这样的情况下，因为需要有一个强有力的领导者，在时代的迫害和在争议，对异教徒，而且还可能向威信依附部长，定期进行服务的圣餐。

Due to the constraint of both high current and high speed, it is difficult to commutate for high-speed and high-current DC machine .

1前言 换向问题是直流电机的固有问题，换向过程十分复杂，影响换向的因数很多。

In order to eliminate the influence caused by the nonminimum phase characteristic of a common Boost DC／DC converter, Viswanathan K has proposed a novel tristate Boost DC／DC converter. For enhancing performance, the statespace averaging model of this converter was first presented in this paper. Due to the nonlinear nature in this model, an inputoutput feedback linearization technique was adopted, and a complete controllable linear system was obtained. Then a statefeedback control strategy was designed based on this linear system. Simulation results show that the proposed control strategy can assure constant output voltage in a wide range, so as to realize the stability of the system during large fluctuation of power supply and load disturbance. Good dynamic performance can also be achieved.

针对 Viswanathan K为消除普通BOOST DC／DC变换器的非最小相位特性而提出的三态Boost DC／DC变换器，为进一步提高这种电路拓扑的性能，在建立了变换器状态空间平均模型的基础上，针对其多变量、非线性特点，采用输入输出线性化将其转化为一个完全可控的线性系统，在此基础上应用现有成熟的线性控制策略进行了控制系统的设计，并且采用MATLAB进行仿真验证，结果表明：这种非线性控制策略可以确保输出电压在大范围内恒定可调，且即使存在大范围扰动(输入电压和负载变化均较大)的情况下，系统也可以确保稳定性和良好的动态性能。

In other words, the bond is due to the development of agents with a series of complex inter-linked the relevant market, for the whole development of the financial market is also beneficial.

换句话说，债券是由于代理人的发展提出了一系列复杂的相互联系的相关市场，对整个发展的金融市场是有益的。

However, it is extremely difficult to construct an accurate lateral dynamic model for a vehicle due to the complicacy of the dynamic model.

然而，车辆动力学模型的复杂性，用复杂模型设计出的控制器也是复杂的，且需要多个传感器对多个物理量进行检测，使其很难在实际车辆中应用。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。