查询词典 necessary

So better understanding of their mechanisms of action and the structure-function relationship is necessary to design a nontoxic yet active derivatives

因此研究它们在生物体内的作用机制，进而解释药物的构效关系，对设计活性高、毒副作用小的抗生素药物具有重大的理论和实际意义。

Germany will get Nord Stream built—if necessary with money from the European Union.

德国将建设北欧天然气管道项目－－如果有必要的话，从欧盟取得资金。

The price of this kind of life is all efforts necessary to maintain American interests, including letting the silly House of Saud rule over that prosperous nation, and keeping despots like Suharto, Noriega and Saddam who serve America in place, this is also true.

这种生活的代价是全力维护美国的利益，包括让愚蠢的沙特王室继续统治这个富裕的国家，让苏哈托、诺列加、萨达姆这样的暴君存在，为美国效力充当前驱。这也是真的。

A important result is the one-order expression of AR Yt = DYt-1 + E, from paralleling a high-order differential equation transformation into a one-order differential equation system, the one-order expression exposes that the AR is only a certain more-multivariable power series processAnd, if a process is described as an AR, the sufficient and necessary condition is the spectrum norm A of the coefficient matrix D less than one.

作者用高阶微分方程化一阶微分方程组的方法，获得多元弱平稳序列p阶自回归模型的一步滑动平均表达式，证明了AR的是一个更高维的幂级数的线性过程，从而，说明了AR关于序列依概率成立的充要条件是：该模型更高维的幂级数的线性过程的表达式中系数矩阵D的谱范数λ＜1。

Then the necessary conditions of optimal control problem is obtained by the conception of normal cone.

由法锥概念得到了控制问题的最优必要条件。

The third chapter is about the optimal control for a class of age-dependent competitive population dynamics with diffusion, the continuity properties of the system solution in terms of the control variable is certificated, the Normal cone theory is applied and the necessary conditions of optimal control problem is obtained.

第三章研究了一类年龄相关的具有空间扩散的竞争种群系统最优控制问题，证明了最优解关于控制变量的连续依赖性，应用法锥理论，得到了最优解的必要条件。

Chet - Kolmogorov theorem,then obtains a necessary condition of the optimal solution to the nonlinear control problem according normal cone principle.

然后利用法锥理论得到了最优解存在的必要条件。

The normal expression of these genes and proteins is necessary to keep the normal function of human ovarian.

在人卵巢中这些基因的正常表达是卵巢功能保持正常的前提。

Calcium is necessary for normal DNA function.

钙是必要的正常DNA的功能。

The case of AZ provides evidence supporting the existence of a genetically determined, specialised mechanism that is necessary for the normal development of human language.

AZ的案例提供了证据，支持一种遗传学决定、特定化的机制，这对于人类语言的正常发展乃是必须的。

You can do some assertiveness training.

你可以进行一些自信训练。

We were well on the path to making a rear-wheel-drive global platform," says Mays."

我们正致力于建立一个后轮驱动的平台，"Mays这样说道。"