At the time of the end-Permian extinction, Antarctica was some distance north of its present location, warmer than it is today, and not covered with permanent glaciers.
在二迭纪末时期，南极比现在的位置往北偏一些，比今天热一些，没有覆盖永久冰川。
It USES reflection of object, atmosphere extinction coefficient of two laser wavelengths and others key technology to improve the observational distance of laser radar.
利用目标的反射光、两种激光波段的大气消光系数和其它关键技术来提高激光雷达的探测距离。
It USES reflection of object, atmosphere extinction coefficient of two laser wavelengths and others key technology to improve the observational distance of laser radar.
利用目标的反射光、两种激光波段的大气消光系数和其它关键技术来提高激光雷达的探测距离。
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