Aliases are optional, and they let you supply your own names for resources associated with the environment profile.

别名是可选的，它们让您能够为与环境概要文件相关联的资源提供自己的名称。

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The transformation provides an optional, lightweight profile that you can use to model and generate most CORBA elements.

它提供一个可选的精巧的配置文件 ，您能够使用该建模并且生成大部分CORBA元素。

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The statement profile section is optional.

语句概要文件部分（statement profile section）是可选的。

youdao

When Facebook rolled out its Timeline feature in 2011, some members balked at the radically different look and even started petitions asking that the new profile pages be made optional.

CNN: Facebook to announce new look for News Feed

Optional buys include tickets to the highest profile parties, many with nationally or world famous musical acts, events that are very hard to get tickets to otherwise, including the Playboy, Rolling Stone, ESPN NEXT and Maxim parties held on Friday and Saturday nights before each Super Bowl.

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