Everything that is required for a module to carry out its responsibilities should be embedded inside the module. In other words it should be discrete and independent as much as possible, like a stand-alone unit.
圖像來源，Getty Images
，推荐阅读下载安装汽水音乐获取更多信息
From the bird’s-eye view, this proposal aims to:
如今，他已经在北京生活了三十多个年头。算起来，比他在家乡待的时间长出一倍。
Semicircle simulator