The safe environment of the East Asia region in the 21 century and its change is the focus problem concerned by the whole people who concern national security in East Asia .
21世纪东亚地区安全环境演化是一切关心东亚地区安全的人们备加关注的焦点问题。
The MCC formed and developed under the favorable environment by the interaction of weather systems of low and high latitudes in abrupt change period of East Asia general circulation.
本例MCC发生在大气环流调整期，高低纬天气系统的相互作用产生了有利的物理量场配置。
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