几个

Concentrated marketing strategy:The firm concentrates on serving many needs of a particular customer group.

集中营销战略：在细分市场基础上，选择二个或少数几个经过缜密定义的细分市场作为目标市场，实行专业化生产和销售，以求在个别少数市场上发挥优势，提高市场占有率。

Many softirqs can always be executed concurrently on several CPUs, even if they are of the same type.

多个软中断总是能在几个CPU上并发地执行，即使它们是相同的类型也不例外。

Cluster is a relative steady microcosmic or sub-microcosmic congeries which is composed of several or even thousands of atoms or molecules through chemical or physical combining force .

团簇是由几个乃至数千个原子或分子通过一定的化学或物理结合力组成的相对稳定的微观或亚微观聚集体。

We started abusing him, one conspirator after another adding his bitter words.

我们这几个预谋者一个接一个地咒骂他，恶狠狠地骂个不停。

On the basis of the conclusion above, the nonlinear weak controllable vectors can be obtained, which compose the second class of weak controllable matrix, by means of matrix transfermations of the first class of weak controllable matrix. Furthmore the second criterion of weak controllability, accessibility and strong accessibility, which is more standard, more succinct and more practical, is obtained. On the basis of the first criterion and the second criterion, several important problems about nonlinear controllability are discussed, which include 1 local controllability; 2 three classes of local controllable decomposition, separately by means of local coordinate changes in the neighborhood of a nonsingular point, a point on a singular surface or a designated point x〓 with a designated input u〓; 3 the character of controllability of the ith state variable x〓 in different controllable areas and their boundaries.

在第一判别定理和第二判别定理的基础上，我们分析了非线性系统受控性质中的几个重要问题，所得到的结论包括i得到了非线性系统在可平衡点附近的能控性判别定理；ii分别给出了非线性系统在非奇异点、s阶奇面以及在状态空间内给定的一点x〓和输入u〓上的三种状态分解形式以及相应的求解方法；利用系统的Ⅰ型弱能控矩阵与Ⅱ型弱能控矩阵秩相等的条件，得到了只用系统的前n个弱能控向量来判断系统的弱能控性的判别定理；iii通过引入系统状态分量的三类受控区域边界的定义及相应的求解方法，初步探讨了非线性系统各个状态分量在不同的受控区域及其边界上的受控性质。

The pawnshop had sold the plates of his Flora after the expiration of thirteen months. Some coppersmith had made stewpans of them.

那当铺，过了十三个月，便把他那套《植物图说》的铜版全卖了，几个铜匠拿去做了些平底锅。

I get letters from Vanity Fair,Cosmopolitan etc.asking me for stories,articles,and serials,butam publishing nothing for six months or a year（afew stories sold to Scribner's the end of last year and one funny article out） because I know thatnow is a very crucial time and that it is much moreimportant for me to write in tranquility,trying towrite as well as I can,with no eye on any market,nor any thought of what the stuff willl bring,oreven if it can ever be published——than to fall intothe money making trap which handles American writers like the cornhusking machine handled mynoted relative's thumb .

我收到《名利场》、《世界主义者》等刊物来信约我写短篇小说、文章、连载，但我最近六个月或者可以说这一年都没有发表作品（年底为斯克里布纳的刊物写过几个短篇小说和一篇滑稽文章），因为我知道，现在是非常关键的时候，对我来说，安安静静地写作，尽可能写得更好，既不关心市场，也不考虑金钱能带来什么，甚至不考虑我的作品是否能出版——这一切比落入操纵美国作家们的赚钱陷阱重要得多，这个陷阱就像玉米脱壳机夺去了我那著名的亲戚的拇指。

You're one of those people the war didn't change and you go right on thinking and acting just like nothing had happened--like we were still rich as Croesus and had more food than we know what to do with and guests didn't matter.

你是个没有被战争改造过的人，因此思想行为一如以往，仿佛什么事也不曾发生----仿佛我们仍然十分富足，有的是粮食，用不着精打细算，多来几个客人也没关系。

The main job and contribution of this paper are as follows:Based on narrowband signal processing, we propose a new method for FH signal blind detection and blind parameter estimation. Firstly, compute the cross-correlation function of FH signals from multichannels, then we get the cross power spectral density matrixCSDM Secondly, select the hops of FH signals from the CSDM via processing and analyzing the CSDM, meanwhile reduce the influence coming from noise, fixed frequency signal and other interferences; Lastly, estimating the DOA of every hop and according to the DOA, we can separate the hops, get the number of FH signals and their parameters. Propose a new method for designing the threshold in FH signal detection. This method makes it easy to get the threshold by theoretic computing and it can extremely reduce the interference of non-FH signals.Based on broadband signal processing, we propose a new method for FH signal blind detection and blind parameter estimation. Firstly, get the DOA of the signals by wideband spatial spectrum estimation; secondly, separate the signals by spatial filtering using wideband beamformer; Lastly, we propose two methods for FH signal blind detection and blind parameter estimation, one is for several constant hop-rate FH signals whose dwell-time are different and another is for a single FH signal whose hop-rate is alterable.By employing spatial interpolation in broadband signal beamforming, it can reduce the number of antenna elements and corresponding RF modules, A/D converters, etc. It can also eliminate the mutual coupling between antenna elements while getting the narrower main beamwidth and lower sidelobe level.

本文的主要研究工作和贡献如下：●提出了一种基于窄带处理的FH信号盲检测和参数盲估计的实现方法，即首先求出多路信号之间的互相关，进而得到互功率谱密度矩阵，然后通过对CSDM进行对折处理来抑制噪声、定频信号及其他干扰的影响，并将所有属于FH信号的hop(每一跳的驻留时间在时频图上持续的线段)从CSDM中筛选出来，最后用阵列信号处理中的到达方向估计理论在频域中估计出各个hop的方向参数，利用方位信息完成FH信号分离并得到FH信号的数目及其各自的参数集；●提出了一种确定FH信号检测门限的策略，该策略不仅使得检测门限能够通过理论计算得到，而且还显著地抑制了非跳频信号的干扰，从而能有效地检测出FH信号；●提出了一种基于宽带处理的短波FH信号盲检测和参数盲估计的实现方法，即首先利用宽带空间谱测向技术得到接收信号的DOA，然后采用宽带波束形成技术对特定方向进行空间滤波，实现多个信号的分离，最后分别提出了两种FH信号的盲检测和参数盲估计方法，第一种方法适用于空间某个特定方向上存在着几个驻留时间不同的恒跳速FH信号和其他干扰信号的混合信号，第二种方法适用于空间某个特定方向上仅含一个可变跳速的FH信号和噪声的混合信号；●将空间插值的概念和宽带波束形成技术结合起来，提出了一种基于频域处理的宽带恒定束宽的波束形成方法。

And take with thee ten loaves, and cracknels, and a cruse of honey, and go to him: he shall

现在你要带十个饼，与几个薄饼，和一瓶蜜去见他，他必告诉你儿子将要怎样。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。