Small planets close to their parental stars risk becoming tidally locked: that is, the lengths of their days come to match their orbital periods, and they thus have one permanently hot hemisphere and one that is permanently cold.

Just as Mercury is locked facing the sun, the planet is tidally locked to its star, so that one side basks in perpetual daylight, while the other side remains in darkness.

与水星总有一半固定地面对太阳相似，该行星总是始终保持一面朝向恒星，使得星球的一半永久处于阳光之中，而另一半则永久位于黑暗。

Theory of contraction-map is applied to the nonlinear difference equations to show that the perturbed system admits almost periodic solutions near a hyperbolic periodic orbit of the unperturbed system if the perturbation is sufficiently small.

将不动点定理运用于非线性的差分方程，得到在扰动充分小时，未扰动系统所存在的双曲周期轨道在干扰下产生概周期解。

For the expansive flows with tracing property, this paper is to show that the topological dynamical property near by the periodic orbit is the same as that of the hyperbolic periodic orbit.

证明了具有跟踪性的可扩流在其周期轨附近的拓扑动力性质与双曲周期轨相同。

In terms of the astronomical calendar, October in China is beautiful autumn;

从天文纪年的角度来说，10月在中国是美丽的秋天；

The distribution of the land desertification in China and its harmfulness

我国土地沙漠化的分布与危害

The land desertification assessment is an important theory in the research of desertification.

土地荒漠化评价是荒漠化研究中的重要问题。

Study on ecological benefit of control of sandy land desertification in Heilongjiang

黑龙江省沙质荒漠化土地治理的生态效益研究

Study on Land Desertification Situation and Control Strategy in High Frigid Regions of China

高寒地区荒漠化现状与防治途径探讨

Causes and Prevention& control of land desertification in Inner Mongolia

内蒙古沙漠化土地成因与防治

Researches in applying remote sensing technology to coastal land desertification monitoring

遥感技术在沿海土地沙化监测中的应用研究

Application of the Fuzzy Mathematics Method in Assessment on Sensitivity to Land Desertification

模糊数学方法在土地沙漠化敏感性评价中的应用

Study on the Land Desertification Causes and the Grass Industry in North China

我国北方土地荒漠化成因与草业发展研究

Process and cause of land desertification in northern East China

中国东部沙区的荒漠化过程与起因

Henan land desertification dynamic change and discussion of control measures

河南荒漠化土地动态变化及治理对策探讨

Study on Ecological Compensation System and Land Desertification Controlling

生态补偿制度与土地沙漠化治理研究

The present situation and tendency of land desertification in China and its control

中国土地沙漠化现状趋势及其治理

Design and Development of the GIS-based Land Desertification Monitoring System

土地沙化监测GIS系统设计与开发

This paper analyzed human action and effect in the process of land desertification;

从三个方面剖析了人类在土地沙漠化过程中的作用；

Discussion on Classification System of Land Desertification in China

中国土地荒漠化分类系统探讨

Land Desertification Control Research on High and Cold Area of Qinghai Province

青海高寒地区沙化土地治理途径的研究