其次，把要表现的态势元素封装成态势对象，并构造态势对象类和态势表现类；
Next, the situation elements are packed into situation objects and the situation object classes and situation representation classes are constructed.
在上世纪70年代末和80年代初，对非洲稀树大草原大象的杀戮呈现激增态势，很重要的原因来自于亚洲对象牙雕刻品的不断增加的需求。
In the late nineteen-seventies and early eighties, there was a spike in the killing of Africa's savanna elephants, caused largely by increased demand in Asia for ivory carvings.
但现代战争涉及到的作战对象多、协同关系复杂、战术机动频繁，建立一个完善的态势估计模型存在很多困难。
But because of the large quantity of targets , complex cooperation relations and frequent tactical movements in modern wars, it is very difficult to set up a perfect model of situation assessment.
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