用户一般不用与它们打交道，因为它们是框架内部使用的；但是，它们代表了JCR模块主要的扩展点。
Normally, users do not have to interact with them as they are internal to the framework; however they represent the main extension points for the JCR module.
在使用Spring配置JPA把大段代码分割为小模块的时候，开发人员就可以利用扩展点。
The developers can use the extension points when using Spring to configure JPA for organizing a large code base into smaller modules.
系统由一个PL C本体模块和多个PLC扩展模块组成，实现了主从模式的一点对多点的数据传输。
The system, which consists of one body module and a number of extension modules, achieves one point-to-multipoint data transmission based on master-slave mode.
系统由一个PL C本体模块和多个PLC扩展模块组成，实现了主从模式的一点对多点的数据传输。
The system, which consists of one body module and a number of extension modules, achieves one point-to-multipoint data transmission based on master-slave mode.
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