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Android is a mobile operating system based on a modified version of the Linux kernel and other open source software, designed primarily for touchscreen mobile devices such as smartphones and tablets.
安卓（Android）是一种基于Linux的自由及开放源代码的操作系统。主要使用于移动设备，如智能手机和平板电脑，
Bootstrap 是最受欢迎的 HTML、CSS 和 JS 框架，用于开发响应式布局、移动设备优先的 WEB 项目