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Based on Pontryagin maximum principle,the lunar soft landing problem is transformed into a two-point boundary value problem in mathematics.

首先，从庞德里亚金极大值原理出发，将有限推力作用下月球软着陆问题转化为数学上的两点边值问题；在考虑边界条件及横截条件的前提下，将该两点边值问题转化为针对共轭变量初值和末时刻的优化问题；然后应用非线性规划方法求解所形成的参数优化问题。

Based on Pontryagin maximum principle, the lunar soft landing problem is transformed into a two-point boundary value problem in mathematics. In consideration of the bound condition and transversality condition, the resulted two-point boundary value problem is converted into a parameter optimization problem aiming at the initial values of conjugate variables and the terminal time, then it is solved by the nonlinear programming.

首先，从庞德里亚金极大值原理出发，将有限推力作用下月球软着陆问题转化为数学上的两点边值问题；在考虑边界条件及横截条件的前提下，将该两点边值问题转化为针对共轭变量初值和末时刻的优化问题；然后应用非线性规划方法求解所形成的参数优化问题。

Pop art movement was born in England in the 1950's.

20世纪50年代末波普艺术诞生在英国。

Output wave at the end of 50's in 20 centuries pop art,is direct set modernism of reasonableness.

20世纪50年代末产生的波普艺术，是直接将现代主义设定的理性。

From late 1970s,Chinese technological staff began to do deep research on the issue of population control and achieved a lot of researching results at three levels: population database , technology and soft ware of population analysis, the informational system of population management, the surporting system of population strategy and population forecast and software are at practical research level; the system control theory of nonlinear population distribution parameter in this article is of basic research.

从七十年代末，我国科学技术工作者开始对我国人口控制问题进行了深入的研究，分别从三个层面取得了许多研究成果：人口数据库、人口分析技术和软件、人口管理信息系统、人口决策支持系统、人口预测和软件等，属于应用研究层面；人口系统论和人口控制论等属于应用基础研究层面；而本文的非线性人口分布参数系统控制理论，则属于基础研究。

This porker contains 54 pictures, it show the culture of Beijing in later qing period, at the same time it show some pictures of emperors in qing period.

本扑克 54 张风俗图画，描写工致，刻画逼真，忠实地反映了晚清时代老北京的民俗写真，也反映了清代末季同治、光绪间之世象。

A Halberstam paragraph usually filled a page, unfolding portentously towards some great quotation that glimmered in the final line.

一个哈伯斯塔姆式的段落往往占满整个页面，预示性地向文末熠熠生辉的伟大语录演进。

There was the usual romantic postscript at the end of his letter.

他的信末又是一贯的浪漫附言。

She added a postscript to her letter.

她在信末又附了一笔。

Many people like to advise us that after all life is nothing buta daydream in which a man experiences sorrows and joys and en-joys a life of wealth, comfort and success, but after he awafinds only a pot of millet is still cooking on the fire for him.

很多人都喜欢告诉我们，人生不过如一场黄粱梦，在繁复的美丽与曲折的悲欢之后，悠然醒转，新炊却犹末熟。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。