N a principal subdivision of a class 亚纲; 子集
V to assign to a subclass 将···分入亚纲; 将···编入子集
There are three base implementations provided for subclassing.
所提供的用于生成子类的基本实现有三种。
The other problem with ActiveRecord that transparent persistence solves is subclassing.
透明持久化解决了的ActiveRecord的另外一个问题就是子类化。
Cleaner Web filter mechanism that allows more pluggable filtering support without subclassing.
更干净的Web过滤机制，无需子类化就可支持更多的插件式过滤器。
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