Within the measurement infrastructure, counters are structured using a two-level hierarchy.
在测量基础架构中，用两级层次对计数器进行结构化。
The dates have been automatically grouped into six two-month ranges, which then form the next level of the hierarchy.
日期被自动编组为6个范围，2个月一个范围，然后这些范围形成了分层结构的下一级别。
Searching variables in two level hierarchy, it is possible to avoid the appearance of unfeasible results. So the search space is greatly reduced and efficiency is improved.
通过将需寻优的变量放在内外两个层次进行遗传搜索，可避免无理解的产生，使搜索空间大大缩小，提高了搜索效率。
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