不充分

By analyzing the distribution of the zeros to the transcendental characteristic equation associated with the trivial.solution,we obtain some- sufficient conditions on the stability and instability of the trivial solution.These results are generalized to n-unit neural networks by means of space decomposition in this Chapter.

在第二章中，我们讨论了不带自反馈与带自反馈的3元环状神经网络系统平凡解所对应超越特征方程的根的分布情况，确定了系统平凡解稳定与不稳定的充分条件，并利用空间分解的方法把相应的结果推广到n元环状神经网络系统。

Based on the invariance of maximum likelihood estimation, the sufficient and necessary condition under which the maximum likelihood estimation has invariance for the parameters are given, then it uses this conclusion to calculate the maximum likelihood estimation of σ^2 and ρ for bivariate normal distribution.

根据参数极大似然估计不变性原则，给出在一定条件下极大似然估计具有不变性的充分必要条件，并利用该结论计算了二元正态分布Z=的未知参数σ^2和ρ的极大似然估计值。

The unsuspecting photographer focuses with the lens wide open to place the circle of least confusion at the sensor position b, and, taking the actual picture at a reduced aperture, he is unaware of the ensuing focus shift that prevents him from getting the best out of the lens.

一个经常使用全孔径来拍摄的摄影师会毫不犹豫地把胶片放在B点，但是如果他不改变胶片的位置，当他使用小光圈的时候，事实上，他就不可能充分利用这个镜头拍到最好的照片了。

Then it proves a necessary and sufficient condition for anamalgamation of two 3-manifolds with toms boundary with no new incompressible surfaces.Lastly, with the help of the condition and the theorem about the classification of allautomorphisms of a torus, it is proveed that there exists infinitely many 3-manifolds each ofwhich contains no incompressible surfaces besides a torus.

最后，文章给出了以环面作为边界的两个3维流形在作融合积时不产生新的不可压缩曲面的一个充分必要条件，并将这个结果与关于环面到自身的自同胚类的分类的结果相结合，证明了本文的一个核心结论，即存在无穷多个互不同胚的3维流形满足除了一个环面以外不含有其他的不可压缩曲面。

Based on the analysis of e-marketing, macro-strategies and micro-application of e-marketing are emphasized, A new concept is suggested, that is e-communication, e-research and e-trade which could be combined together to realize e-marketing. We suggest that we should make full use of all technique methods and communication patterns provided by e-business rather than limiting on simply e-advertisement or product promotion. According to the special features of e-marketing we can approach to choose the best e-trade pattern different with traditional way, such as trade information consignation obtain, electro-media, and virtual company etc.

基于对电子营销的分析，本文着重阐述了电子营销的战略及具体的实施方式，提出利用电子沟通、电子调研、电子贸易综合实现电子营销的概念，认为电子营销不应仅使用简单的电子广告，产品推荐等营销手段，而应充分利用电子商务所能提供的所有技术手段与交流方式，并根据电子商务的特点，选择不同于传统营销的营销方式。

By giving the example, explains that theorem 4 in the refuted paper is not the necessary condition of the continued fraction convergences, by discussing the indeterminacy of the lever function and citing the counterexamples, expounds that the theorem 4 is not sufficient condition of the parameters W and W -1 neutralizing each other, and so shows algorithm 1 and 2 in the refuted paper to be incorrect.

通过举例说明了"攻文"定理4不是连分式收敛项的必要条件，并通过对杠杆函数不确定性的讨论和反例的举证说明了"攻文"定理4不是W与W –1相互抵消的充分条件，从而证明了"攻文"算法1和2及其衍生方法是错误的。

In the current education of children's fine art, the adults mostly stiffly request the children to draw something they can not understand , just like singing crabbed songs, difficult to understand and unable to have in common the emotion sympathetic chord, also unable to express ones own mind , and the children's art potential is impossible to obtain the full display.

在当前的儿童美术教育中，成年人大多生硬地要求儿童画一些他们不能理解、成年人式的东西，这犹如唱一些艰涩难懂的歌曲，无法产生情感上的共鸣，也无法让孩子表达自己独特的感受，他们的艺术潜能也就不可能得到充分发挥。

It is unrealistic to eliminate thoroughly the effects of credit sale risk. In the operating processes, companies only learn and avoid them partly.

要完全消除赊销风险及其影响是不现实的，企业只能尽量充分而不能完全的认识和避免。

After analyzing the three major defining standards in the theoretical field, the writer presents the defining standard on the cooperative behavior of cheating insurance money: With the consideration on the influence of the status of the employees in the insurance company on the nature of cooperative crime as the presupposition, firstly the nature of the cooperative crime should be defined according to the criminal nature of the committer, and then to decide whether the committers should be convicted separately by contrasting the degree of the crime legally defined.

有学者提出保险诈骗罪的法定刑应该提高，本文不赞成此观点，认为将本罪的法定刑提高，与刑法的谦抑性原则不符，应该从社会环境、经济体制等方面来寻找解决问题的途径，而不应一味加重刑罚的力度；刑法是整个社会的最后一道防线，在应用这道防线时应当充分考虑到成本和效益的问题。

We obtain sufficient condition such that a class of uncertain nonlinear system is robustly dissipative .

在分析不确定系统鲁棒耗散条件的基础上，给出了一类不确定非线性系统鲁棒耗散的充分条件。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。