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Therefore, that the *** ban smoking is very necessary and important to us.

因此，政府禁烟对我们来说是非常必要的和重要的。

Of course, this is not possible and it was not necessary, and menstruation can want to ban a few days.

当然，这是不可能的，也是没有这个必要，月经也想禁止几天。

The paper addresses the existence problem of generalized inverses for elements of a Banach algebra under perturbations and derives a sufficient and necessary condition for the existence of generalized inverse.

文中讨论了Banach代数元扰动后广义逆的存在性问题。用线性算子广义逆的稳定性问题的方法，得到Banach代数元扰动后广义逆存在的充分必要条件以及稳定的一个充分条件

For a given strictly proper rational function matrix over a commutative Banach algebra, the controllable, observable realizations have been constructed, the uniqueness of minimal realizations under the system equivalence has been proved, also, the necessary and sufficient conditions for decoupling have been given.

对给定的定义在交换Banach代数上的严格真有理函数矩阵，构造了可控型、可观型的实现，证明了其极小实现在系统等价意义下的唯一性；给出了交换B.fi。

The necessary and sufficient condition which fundamental and total biorthogonal system in Banach space Schauder basis are provided.

本文利用BK空间的理论讨论了乘子空间M的性质，给出了Banach空间X上基本完全的双正交系成为Schauder基的充要条件。

Based on the above results, plane strain deformation is considered to be a necessary condition of shear banding.

基于对以上研究结果的讨论，本文认为，剪切带是在平面应变变形条件下当应变硬化率降到很低时发生的。

I wish to teach, or rather, to inspire the bandsman by this score about my attitude, and method, as well as all necessary skills in creating it. They should then try to forget all the monotone and sweet notes on the score, and on the basis of the remaining images in their mind, to consummate in cooperation with other bandsmen this music work that requires imaginative recreation.

我希望教会，或者说让乐手通过这些音符熟悉我这次创作上的态度、方式，以及种种必需掌握的技巧内容；随后他们应当尽量忘记乐谱上面的所有单调而甜美的记谱，用残留的意象来同其他乐手合作完成这部需要填充的作品。

It is necessary to one's credit that he takes up his note at the bank when due.

付清银行到期期票对一个人信誉来讲是很必要的。

I never considered it necessary to check the calculations on my bank statement.

我从来不认为有必要检查的计算我的银行对帐单。

However, it'sa necessary task to keep yourself out of bankruptcy.

然而，这是必要的任务，以保持自己的破产。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。