Chapter 2, general survey of relative theories, is mainly about theory of metropolitan and theory of industry spaceseparation and reunion.
第二章，相关理论概述，主要是都市圈理论和产业空间聚散理论。
2
If the spaceseparation between strong signal and weak signal more than one beam width, the algorithm proposed can effectively extract weak signal without knowing weak signal's direction of arrival.
当强信号与微弱信号的空间间隔大于一个波束宽度时，该方法可较好地实现对微弱信号的提取。
3
Nasa's shuttle Discovery is getting ready to blast off into space one last time, after technicians reattached a main separation nut that fell off on Friday.