这种模型逐级缩小搜索范围，有效地减少了搜索的工作量，节省了计算的规模和时间。
The kind of model reduces hunting zone progressively, reduces the searching workload effectively and saves the scale and time in computing.
采用多个SOM网络逐级模式识别方案，有效地提高了锅炉污染模式识别效果，并可以确定发生污染的具体部位。
By using hierarchical pattern recognition with much SOM network, the identification effect of boiler pollution mode is improved, and the accurate locations can be acquired.
大学生们随意地将不常用的商标逐级分级。
The undergraduates gradually grade the unusual trademarks casually.
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