The source and server-side metadata models are defined as optional packages.

源模型和服务器端元数据模型被定义为可选包。

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Here you can select optional packages to install and read their descriptions.

在这里，可以选择可选软件包来安装，还可阅读其说明。

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We are a group of volunteers providing the core and optional packages for CRUX.

我们这些志愿者为CRUX提供了核心及可选包。

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They also block hotel rooms and offer these, with private ground transportation, along with countless optional activities throughout Super Bowl weekend as add-ons to ticket packages.

FORBES: You Can Attend Super Bowl XLVII in New Orleans - Like Beyonc��