Multiple version support for installed packages.
对已经安装的gem包提供多版本的支持。
The main difference between those two types of packages is how they are installed.
这两种类型包之间主要的不同点在于它们的安装方式不同。
They may not be clear on what packages are installed, or where.
他们可能不知道已经安装了哪些软件包，或者安装到了何处。
Look for the following packages that could be currently installed on your system.
寻找下列当前可能已经安装在您系统上的软件包。
Your package name must be unique across all packages installed on the Android system.
你的包名称必须在安装了Android系统上的所有软件包是唯一的。
Your package name must be unique across all packages installed on the Android system.
你的包名称必须在安装了Android系统上的所有软件包是唯一的。
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