Traditionally because of limited teaching resources and means a teacher had to rely on boards and chalks to impart knowledge to students which make teaching inefficient narrow and without extensions. With the characteristics of fast and abundant supply of information the CIA is the best solution to those problems. The CIA makes teaching visual understandable and effective widens the students' horizon of knowledge and arouses their learning interests.
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Animation is also one of the few things that cannot be currently accomplished efficiently across browsers without using special extensions.
动画也是目前不使用特殊的扩展就不能实现跨浏览器的少数几种技术之一。
Aggregating allows any number of extensions to be added, without the need for defining all possible combinations of subclasses.
聚合允许添加任意数量的扩展，而无需定义子类的所有可能的组合。
This provides the ability to simply drop in new extensions, such as various security extensions, without requiring modification to the user's classpath.
这提供了简单地访问新扩展的能力，例如不同的安全扩展，不需要修改用户的类路径即可实现。
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