化为

For this metric, the field equations can be reduced to the Ernst equation with the parameter.

通过适当的手续，场方程化为带有参数的Ernst方程。

Based on Crank-Nicoson's technique, and a new approach for the numerical simulation of the model is raised. The truncation error of the one step difference method reaches O (△t^2+△x^2) and of quite good stability condition.

基于Coriolis加速度和Lagrangian应力公式，利用Newton第二定律导出轴向加速度运动弦线横向振动的动力学模型；通过线性变换将方程化为一阶无量纲的非线性微分方程组；并利用Crank-Nicoson的中点离散技巧，给出运动方程的单步二阶差分方法；算法把对运动方程和本构方程分别离散，使之可以用于不同本构的运动弦线的数值仿真。

China boasts its long history and the erudite culture.

中国以其悠久的历史和博大精深的文化为荣。

I believe it will evolve into a Depression.

我认为它会演化为衰退。

Living in the wonderful space of your own, appreciate the delicate and artistic furniture and taste the exiguous movement of life slowly!

每一天都恣意地生活在自己塑造的空间里，欣赏如艺术精品般的家具，将生活的感动化为细致的品味，慢慢鉴赏。

However, in recent years, people ignore social and ecological effect because of the rapid development of tourist industry. In their eyes, the tourist industry is smokeless, pollution-free with low-input and high-output industry. In practice, they are eager for quick success and instant benefit, simplifying the development of tourist industry as expansion of number and extensionality, developing the tourist resource predatorily, managing travel industry sites extensively, and making travel facilities expand abnormally.

旅游经济高速发展的喜悦使得人们一度无暇思考旅游发展所带来的社会和生态效益，甚至沉醉于"无烟工业"、"无污染产业"、"低投入，高产出"的错觉中，在实践中则表现为急功近利，将旅游业发展简单化为数量型增长和外延性扩大，对旅游资源进行掠夺性开发，对旅游景区采取粗放式管理等，从而导致旅游资源与环境危机、旅游社会冲突与旅游经济发展的矛盾日益尖锐。

Among them, the feedstuff enterprise characteristics of the United States is:(1) the production scale extend increasingly, the integral whole change into the main current;(2) the main profits of the enterprise comes from the scale;(3) high-tech and extensive application with strict quantity management;(4) the business enterprise enhances the research of the feedstuff with development.

其中，美国饲料企业特点是：（1）生产规模日益扩大，一体化为主流；（2）企业的主要利润来自规模；（3）高科技的广泛应用和严格的质量管理；（4）企业加强饲料的研究和开发。

And established the mechanics model,optimization parameter model,optimization mathematics model for the elastic element of the extensometer,programs analysis file and optim...

以应变计式引伸计弹性元件的结构优化为例，建立了引伸计弹性元件的力学模型、优化参数模型、优化数学模型，用ANSYS的参数化设计语言编制了分析文件和优化控制文件，经计算获得最优结果。

Thirdly, a new loop algebra x with 3 M dimensions is constructed by use of some properties of exterior algebra, which is devoted to establishing a new isospectral problem. As its application, a multi-component integrable system similar to the TC hierarchy is obtained, whose reduction case presents a multi-component KdV equation.

由此可设计出许多新的等谱问题，作为应用，本文得到了一个多分量的TC族，其可约化为多分量的KdV方程。

The problems considered can be very facilely translated into Riemann-Hilbert problem by application of the approaches which are resolved by usual Muskhelishvili's methods, and their closed solutions are acquired rather straightforward.

应用该法可以很容易地将所讨论的问题转化为Riemann-Hilbert问题，而后一问题可以用通常的Muskhel-ishvili方法进行求解，并且可以相当简单地得到问题的闭合解。

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。