In this way, the Android system implements the principle of least privilege. That is, each application, by default, has access only to the components that it requires to do its work and no more.
Android系统通过这种方式实现最低权限原则(the principle of least privilege) .也就是说，每个应用在只需要完成自己的功能而不需要其他服务的时候，默认只对自己的组件有访问权限。
This method is based on the principle of minimum. work in mechanics, the result of adjustment has exactly the same value as obtained by calculations from the method of least squares.
此法基于力学中的最小功原理。其计算结果与最小二乘法平差结果完全一致。
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