add 节点位于标准可视代码片段的数学类别下。
The add node is under the math category of the standard visual snippets.
你学习的每个主题都以某种合理结构展现出来，如果是数学——就用构建模块的方式展现，如果是社会科学研究——就用类别的方式。
Every topic that you study has been presented to you in some type of sensible structure, whether it is math - which comes in building blocks, or social studies - which comes in categories.
分类是要构造一个数学模型(分类器)，该模型能把数据库的记录映射到某一个特定的类别。
Classification needs to construct a model (also called classifier) which makes a map of records in Database with a peculiar class label.
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