月球

He has made systematic high-level research achievements in the study of solar nebular evolution, meteorites, cosmic dust and Apollo lunar rocks, as well as comparative planetology, the climatic and environmental change of, and mass extinction induced by the impact of extraterrestrial bodies on the earth, formation and evolution histories of solar system, two-stage accretion model of earth's origin, original inhomogeneity of the primordial earth and its constraint on metallogeneity and tectonic evolution.

其地下核子试验地质效应综合研究於1978年获全国科学大会奖；吉林陨石综合研究於1986年获中国科学院重大科技成果一等奖和1987年全国自然科学三等奖；《天体化学》专著於1991年获中国科学院自然科学一等奖；月球探测成果更获工业与资讯化部特等奖和国防科工委个人突出贡献奖。欧阳自远院士在国内外已发表专著16部、主编著作14部、论文426篇，培养硕士、博士与博士后65人。

Mercury is in many ways similar to the Moon: its surface is heavily cratered and very old; it has no plate tectonics.

水星在许多方面是相似的月球：其表面严重坑和非常古老的，它没有板块构造。

He plotted the orbit of the moon.

他画出了月球运行的轨道。

My whole face was pockmarked like the surface of the moon!

我的整个脸麻，如月球表面！

A polar ice cap, or polar ice sheet, is a high-latitude region of a planet or moon that is covered in ice.

极地冰盖，或称极地冰原，指的是为冰层所覆盖的地球或是月球的高纬度地区。

In particular, the probe discovered a water-rich plume venting from the moon's south polar region .

特别是，调查发现了一个水资源丰富的羽从月球南部极地排气。

Here is the moon again, in line with the the constellation Gemini's brightest stars, Castor and Pollux, and not that far from the planet Mars.

这又是月球，与双子座最明亮的恒星北河二和北河三在一条直线上，离行星火星并不远。

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。

In this paper,an optimum trajectory from perilune to lunar surface is derived in terms of Pontryagin's maximum principle,which is an open-loop way.Then,an optimal nonlinear control law based on an fuzzy neural network is presented,on the basis of the optimum trajectory,due to the nonlinear mapping function of the fuzzy neural network,which is a closed-loop way.

本文根据终端着陆条件和性能指标，以由Pontryagin's极大值原理得出从近月点到月球表面的最优着陆轨迹为基础，给出一种基于模糊神经网络的非线性最优控制策略，使被控系统能够通过模糊神经网络的非线性映射能力实现某种最优的闭环制导控制。

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。

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。