特征提取的依据是利用有关数学工具，去掉对分类无用的信息，寻找最有效的信号特征来构成用于分类识别的模式特征向量。
The extracting process is to throw off the useless information and look for the most efficient signal feature to form a pattern feature vectors for classification with mathematics tools.
依据大量的地震剖面和水平切片等，分析火山岩的基本地震特征，并以此形成火山岩基本的识别模式。
Basis lots of the seismic profiles and level slice, analyse the fundamental seismic characteristics of the volcanic rocks, and thus formed the fundamental recognition mode of volcanics.
在此基础上提出了权变教学模式，进而论述了该模式的含义、做法，提出依据、特征和优越性。
It also proposes the contingency teaching approach and discusses the definition, practices, theoretical basis characteristics and superiority of this approach.
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