正

Firstly, The sufficient con-ditions of the existence and uniquity of the positive equlibria by applying functional derivative isobtained; Secondly, the global attractability of the positive equlibria is investigated by charateristicroots theory and oscillation theory; Thirdly, regarding the delay as a parameter, conditions of theexistence of Hopf bifurcation and the peridic solution, furthermore, the form of the approximateperidic solution are obtained; Finally, Some specific examples are given and the solution diagrameappears by Matlab.

首先利用导数性质，得到了该模型正平衡态存在惟一性的充分条件；其次，利用特征值和振动性理论得到了该模型正平衡态全局渐近稳定性充分条件；然后，应用Hopf分支理论证明了该模型Hopf分支及近似分支周期解的存在性，并给出了周期解的近似表达式；最后，借助于MATLAB数学软件，举例并绘出了模型数值解的拟合图象，验证了文中定理条件的可行性。

We shall use algebraic methods to study graphs which are highly regular although this regularity is not expressed in terms of the automorphism group.

我们将用代数方法来研究高度正则的图，尽管这种正则性不是用自同构群来表达的。

In this paper,we calculate average deviation s and give two kinds of estimate of standard deviation for the normal population.

求出了正态分布的平均偏差，并由此给出了正态总体标准差的两种新估计。

Col. 2:13, and the Westminster Confession says:"Man by his fall into a state of sin, hath wholly lost all ability of will to any spiritual good accompanying salvation; so as a natural man, being altogether averse from that good, and dead in sin, is not able by his own strength to convert himself, or to prepare himself thereunto" IX.

威敏思特信仰告白，第9章第3条说：「人因堕落在罪恶的状态中，已经完全丧失一切的意志力，不再能实行任何与救恩伴随之属灵的良善。所以属血气的人既是与属灵的良善完全相反，并且死在罪中，他就不可能靠自己的力量，自行归正，也不能自行预备归正。

Chad, my friend＇s son, was at that awkward age－－old enough for his first date, but too young to drive.

我朋友的儿子夏德正处于一个尴尬的年龄———第一次约会正合适，可自己开车又太年轻。

If the outward normal is positive, the shear stress is positive when it points in the positive direction of the coordinate axis which it parallels.

如果该平面法向为正，如XY，XZ。则当剪应力方向与跟它平行的轴相同，则为正。

The truck cast steel three big piece type bogie is easy to maintain. But since the grate weight under spring and the large operation strength during running, it is difficult for the bogie to keep the positive position. The critical speed of the snaking motion is low, which is inapplicable for high speed running. The other type of truck bogie is H type integrative truss. Its structure is complicate relatively, which is not easy to manufacture and maintain. But it can keep the positive position of the bogie preferably. And because it is adopted the structure of axle box one series elastic suspend, the weight under spring reduces. Which achieve the effective control to wheel sets and improve the running quality of the bogie distinctly.

货车铸钢三大件式转向架便于制造维修，但因其簧下质量大，在运行中轮轨作用力大，转向架难以保持正位，蛇行运动临界速度低，不适用于高速运行；货车转向架的另一种形式是"H"型构架一体式，结构较为复杂，不便于制造和检修，但它能够较好地保持转向架的正位，而且由于采用了轴箱一系弹性悬挂结构，降低了簧下质量，实现了对轮对的有效控制，明显地改善了转向架的运行品质。

They tell us, they tell us that they're fighting a war against terrorists. And then we find out that the White House is selling arms to the Ayatollah.

他们告诉我们，告诉我们，他们正与反恐怖分子作斗争，然而我们发现白宫正贩卖武器给伊斯兰。

Meanwhile, experiment with the ternary mixture of methanol, butyl methyl ether and 1-chlorobytane showed that the system was not ternary azeotrope and can be separated by combination of extractive and rectification using water as extractive solvent.

针对甲醇、甲基正丁醚和正氯丁烷三元混合物，研究了该物系的性质，得到该物系不是三元共沸物的结论，并用水作萃取剂，通过实验验证了利用萃取和精馏耦合的方法分离该物系的可行性。

As Joie Chen found out a much ballyhooed high-tech device is helping at least some of those tourists get back in gear .

正像Joie Chen看到的，众多日新月异的高科技产品也正为招揽游客贡献着力量。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。