变化的第二层次——执行变化开端。
这就是第二层次，大约三分之二以下的几行。
This is at the second level, about two thirds of the way down.
第二层次—“违约概率”的计算。
The second level—Caculating of 'Probability of Default(PD)'.
第二层次是中国东、中、西部的比较分析。
The second level is the eastern, central and western comparative analysis.
第一层次是经济易损性与社会易损性评判，第二层次是泥石流灾害易损性评判。
The first is assessment of vulnerabilities on economy and society and the second is assessment of vulnerability on debris flow disaster.
但当第二层次设法产生一个更复杂的行为时，就把下面层次的行为包容进来了。
But when the second layer manages to produce a more complex behavior, it subsumes the action of the layer below it.
但当第二层次设法产生一个更复杂的行为时，就把下面层次的行为包容进来了。
But when the second layer manages to produce a more complex behavior, it subsumes the action of the layer below it.
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