I show us present, fully present, in front of, and before, the background of America.
我展示我们的存在，完整的存在，以美国为背景，从前前后后不同的侧面表现主题。
The system is divided into two parts: front and background management.
系统分为两部分：前台和后台管理。
It includes three parts, they are front ground, background and interface.
整个系统分为前台、后台和接口三部分。
It includes three parts, they are front ground, background and interface.
整个系统分为前台、后台和接口三部分。
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