四组

In chapter 4, the point-to-point and point-to-multipoint switching networks used in group communication in circuit switching networks is discussed.

第四章讨论了群组通信的另一个核心问题：电路交换网中的多点交换网络结构问题。

Methods the models of epilepsy were made by intraperitoneal injection of pentylenetetrazol and the contents of no,mda and sod of all the epileptic hippocampus were assayed and dealt with all data by statistical analysis.

健康sd大鼠38只，分5组，采用戊四氮腹腔注射制作癫痫模型，测定各组大鼠海马一氧化氮、丙二醛的含量和超氧化物岐化酶的活性。

K-means, and self-organizing map and the feature selection methods based on coefficient of variation and simple T-test were integrated. To evaluate the performance of the Samcluster system, the Samcluster was applied to four expression datasets COLON, LEUKEMIA72. LEUKEMIA38, and OVARIAN. The results show that there are only 5, 1,0, and 0 samples misclassified, respectively. We conclude that the proposed scheme. SamCluster. is an efficient method for automatic discovery of sample classes using gene expression profile.

在Samcluster系统中，整合了下列聚类算法：谱系聚类、K-平均值聚类和自组图聚类与变异系数计算和T-检验等基因变量选择方法，并提出了一致的样本分型概念，通过对四个基因表达谱的数据集COLON、LEUKEMIA72、LEUKEMIA38和OVARIAN的测试，结果表明：误判的样本数分别为5、1、0和0个，因此，基因水平的样本分型与样本的临床分型高度一致。

But in the end, when playing the quadruplets in rapid succession, the hand is fairly stationary; you will also have to add hand motions, etc.,-- more on these topics later.

但是到最后，你连续快速地弹奏四音组时，你的手几乎是不动的，但并不僵硬。你还需要加上手的动作–以后再作讨论。

In Chapter 4, by means of the result obtained in Chapter 2 and as in the autonomous case, the author adopts a direct constructive method and obtains the local exact controllability for general nonautonomous first order quasilinear hyperbolic systems.

在第四章，作者以第三章建立起来的半整体C~1解理论为基础，采用一个与自治系统情况相似的直接构造方法得到了非自治一阶拟线性双曲组的局部精确能控性。

This data format is very useful, because most of the transformation and lighting calculations are performed using 4x4 matrices or quaternions.

顶点着色器使用的这种数据格式非常的有用，因为大多数的转换和光线计算的进行都需要使用4x4的矩阵或者四元组。

Methods Using the MS medium as the basic medium, the explants shoot apexes and stem segments were cultured to differentiate the regenerations. The autotetraloid with genetic material doubled was achieved by treating shoot tips with colchicine of different concentrations for different long times.

方法以 MS培养基为基本培养基，培养外植体茎尖或茎段获得组培再生植株；用不同体积分数的秋水仙素对无菌苗茎尖进行不同时间的处理，诱导遗传物质加倍的同源四倍体。

The two groups were retested four years later, and the study compared the results with the first test.

这个组孩子四年后再次进行测验，测验结果同第一次测验进行比骄。

The effect of free-fall on quality of the seed was studied by dropping six seed lots from four different heights on to cement and galvanized iron floors.

种子自由下落质量检测的效果是这样去衡量的，六个种子一组，从四个不同高度降落到水泥地和电镀铁地板上。

In February 1986 Duvalier fled the island, and for the next four years Haiti was governed by a group of civilians and military officers who had supported the former dictator.

在1986年2月杜瓦利埃逃离该岛，并为今后四年的海地是由一组平民和军事人员谁曾支持前独裁者。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。