如果围绕某个函数的简单方向构造一个加密算法，那么想要破解加密的任何人都需要从相反的方向来解密。
If you build an encryption algorithm around a function's easy direction, anyone wanting to break your encryption needs to work at it from the hard side.
可以在构造函数中设置所需要的装配器，但是当装配器改变时需要返回一个普通ModelMBean。
I can set the assembler I want in the constructor, but I need to return a normal ModelMBean if the assembler is changed.
这个接口的实现需要一个零参数的构造函数，供actionservlet使用，从而确保插件可以正确创建。
Implementation of this interface requires a zero-argument constructor for use by ActionServlet, to ensure the plug-in is created properly.
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