IMF认为世界年度人均GDP下降是全球经济衰退的一个充分条件（而不是必要条件）。
The IMF suggests that a sufficient (although not necessary) condition for a global recession is any year in which world GDP per head declines.
伊拉克给我们的最后一个教训是：外部的仲裁者也许是必要条件，但不是充分条件。
The final thing Iraq teaches us is that while external arbiters may be necessary, they are not sufficient.
优秀的讲演者知道，内容(数据、证据、逻辑)只是真正的世界级讲演的必要条件，而非充分条件。
Good presenters know that the content (data, evidence, logic) is a necessary condition but not a sufficient condition for a truly world class presentation job.
高效的化学毒剂满足化学战的必要而非充分条件。
Powerful chemical agents are a necessary but not sufficient condition for a chemical warfare capability.
但就通用汽车的生存而言，这些只是必要条件，而非充分条件。
These are necessary, though not sufficient, conditions for GM's survival.
借助于变量代换，求解几类线性微分方程，并得到了几个求解的充分必要条件。
With variable substitution, several kinds of linear differential equations are solved and several sufficient and necessary conditions are obtained.
并给出了非线性半定规划的最优性必要和充分条件。
Finally, optimality necessary and sufficient conditions for nonlinear convex semidefinite programming are proved.
它是一个本质定义，因为它试图抓住这个概念的本质特点——即使用这个概念的必要条件和充分条件。
It is an essential definition because it attempts to get at the essential features of the concept - its necessary and sufficient conditions of application.
他有两方面的证据：第一，现存的灾难性撞击的残骸与Baptistina和她的后代有相同的成分，这是必要条件，但并非充分条件，因为含碳的球粒状陨石在其它小行星上也有；
That is a necessary but not a sufficient condition, as the type of rock involved, called carbonaceous chondrite, is found in other asteroids, too.
但是，同样显然的是，这个必要条件也是不充分的。
But, it seems equally clear that this necessary condition (call it the neutrality condition) is not sufficient.
也有理论家提出的许多关于艺术品这个概念的分析，是以必要条件和充分条件这种方式得到陈述的。
There will also be a large number of proposed analyses of the concept of an artwork, articulated in terms of necessary and sufficient conditions.
试图从必要条件和充分条件的角度来分析概念，即便失败了，也能有所发现。
Attempted analyses of concepts in terms of necessary and sufficient conditions, even where they fail, abet discovery.
平衡的膳食结构可能是个体智力及记忆力水平充分发挥的必要营养条件。
The balanced diet may be the necessary nutritional condition for individuals to develop their intelligence and memory fully.
技术优势并不是成功的充分条件，但是，长期来看，它是一个必要条件。
Technical excellence is not a sufficient prerequisite for success but, in the long term, it is a necessary prerequisite.
利用向量比较原理，得到了确定非线性电路平衡点全局渐近稳定的充分必要条件。
The sufficient and necessary conditions for the global asymptotic stability of the equilibrium point of the nonlinear circuits are obtained by vector comparison method.
给出了一个判定齐次线性方程组存在全非零解的充分必要条件。
We present a necessary and sufficient conditions of homogeneous linearity equations existing all-nonzero solution.
给出了其在矩形区域上局部能达和局部能控的充分必要条件。
The sufficient and necessary conditions for local reachability and local controllability in the rectangle are presented.
结果经过研究得出了框架冗余的充分必要条件。
Results Necessary and sufficient conditions for a frame to be redundant are given.
这个方法的开展，是借助于把概念拆分成恰当使用这个概念的必要条件和充分条件。
It proceeds by breaking concepts down into their necessary and sufficient conditions for application.
讨论了双星是否是产生钡星的必要和充分条件，因为已知道的钡星系统全是双星。
The question as to whether binarity is a necessary and sufficient condition to produce barium star is addressed.
给出一类线性切换系统能控性、能达性的充分必要条件，此类系统的特征是具有相同的系统矩阵和不同的输入矩阵。
The sufficient and necessary condition of controllability and reachability of a class of linear switching systems which has the same systematic matrix and different input matrixes is given.
给出了NESAC网结构活判定的充分必要条件以及它们的证明。
Moreover, proves the sufficient and necessary conditions of deciding if NESAC nets is the structural liveness.
任务的复杂性，传感器的使用，武器的选用，还有技术的成熟从必要条件和充分条件两个角度造就了这个座舱。
Complexity of missions, sensors used, weapons employed, and technology available have made this cockpit both necessary and possible.
文章给出判定单体差和多体差存在冗余的充分必要条件，以及消除冗余的线性复杂度的算法。
The sufficient and necessary preconditions to identify redundancy for single and multiple iteration distances are given, and a linear ordered algorithm is described.
在第二个问题中，我们给出了在离散的情形下，指数族势函数严凸的充分必要条件。
In the second we give the necessary and sufficient conditions for strict convexity of power function of exponential family in the discrete case.
本文论述了两列向量组等价的一些充分必要条件，并应用泛函分析的理论进行分析。
In this paper, some necessary and sufficient condition about the equivalence of two column vector groups has been discussed.
本文论述了两列向量组等价的一些充分必要条件，并应用泛函分析的理论进行分析。
In this paper, some necessary and sufficient condition about the equivalence of two column vector groups has been discussed.
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