It takes care of automatically downloading and updating selected tools from a central distribution site, and presents all available tools to the user in an integrated tool catalog.
它负责自动地从中心分发站点下载和更新所选的工具，并在集成的工具目录中为用户提供所有可用的工具。
We'll do this first, as while it's downloading you can check to make sure you have the right versions of the rest of the tools you need.
我们先开始下载，因为在下载的过程中你可以检查一下确保你所需要用到的其余工具的版本都正确。
From the new download list, select and download the following four items (This will take a few minutes-you're downloading the actual OS here, as well as some extra tools).
在新的下载列表中，选择和下载下图中的四个项目(这会花费一些时间，你是在下载真正的手机操作系统和一些其他的工具)。
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