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Chapter two proposes the unified form of Hojman"s conservation law and Lutzky"s conservation law. Firstly, the author introduces the general Lie group of transformations that the variations of both the time and the generalized coordinates are considered, derives the determining equation of Lie symmetry for the system, presents a new conservation law, which contains the Hojman"s and the Lutzky"s conservation law as two special cases, and obtains a condition to exclude trivial Hojmans conserved quantities.

第二章，Hojman定理和Lutzky定理的统一形式：首先，引入一般意义下的Lie变换群(即位型变量q_s和时间变量t同时变换)，给出系统的Lie对称性确定方程，提出一个新的守恒律，Hojman定理与Lutzky定理则分别是这个新守恒律在两个特殊情况下的推论，导出一个可排除平凡Hojman守恒量的定理，并分别讨论了Birkhoff系统和非完整系统的Lie对称性和Hojman守恒量，最后，讨论了Hamilton系统的梅对称性与Lie对称性的关系，给出了由梅对称性求Hojman守恒量的方法。

The neglect of edge diffraction is one of the most important reasons.

这种方法在低频情况下的精度较差，主要原因是忽略了在低频声场中起重要作用的波动现象。

At last, the stability of the earth dam is analyzed under the rapid drawdown.

此外，对大坝在库水位骤降情况下的稳定进行了分析。

A nonstationary EOQ model with lead time uncertainty was discussed in this paper.

考虑了在订货时间不确定且EOQ不是整数情况下的最优订货量问题。

By means of the generalized wedge method and the limit equilibrium method, the most dangerous slip face and the safety factor of a slope, can be ascertained; and then the stability of the left slope of Sankeng Reservoir in Guangdong Province.

分别采用广义楔形体法及极限平衡法对三坑水库左岸山体进行了稳定分析，找出了山体最危险滑面，确定了在山体内存在软弱面情况下的土坡安全系数，对山体稳定性做出了评估，并提出了相应的安全措施。

As an example, the reliability analysis of gravity dam is discussed with consideration of bothnonlinearity in material and randomness in parameters.

作为计算实例，研究了重力坝坝基在考虑非线性特性和随机特性情况下的破坏过程和可靠性指标。

This article mainly discusses the estimation of parameters in accelerated life model with constant-stress based on mixed grouped data.

本文研究了恒定应力加速寿命试验在获得混合分组数据情况下的参数估计问题。

He was not like other boys in the same circumstances.

他和在类似情况下的其他孩子不一样。

It implies the inverse U-shape relation between spread and market imbalance which is empirically demonstrated by Shanghai Stock Market's data.

这个模型能够解释指令驱动市场与报价驱动市场在市场失衡情况下的不同报价行为。

In both situations the immigrant partner must take an active role in the new or investee company .

在这两种情况下的移民伙伴必须在新的或投资公司发挥积极作用，。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。