Once use cases are being identified, the set of activities in a use case can be documented as major steps in a use case.

标识了用例后，用例中的活动集可以作为用例中的主要步骤进行记录。

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Traditional stories make use of formulaic expressions like 'Once upon a time...'.

传统故事采用“从前…”一类的套语。

《牛津词典》

You may not use any of the words in the bank more than once.

词库中的单词只能使用一次。

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Forrester Research says four out of five online adults use social media at least once a month.

VOA: special.2009.09.14

Once we have those classrooms, the stuffing cost is to be designed to be the same as what we currently use in personal physics.

一旦我们建成这些教室，其他的人员成本应该,和现在投入到物理教学,所用的成本一致。

麻省理工公开课 - 媒体、教育、市场课程节选

And then secondly, I get, you know, once I get to learn I also get to use that to help people.

其次，一旦我学到了东西，就会用来帮助其他人，

如果成为医生 - SpeakingMax英语口语达人

He did not, for once, use the word "choice" or talk about the election.

BBC: Healthcare ruling is good for democracy

The software itself, once you use it, is easy to use, flexible, and powerful.

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That just means consumers can buy their music once and use it on every device.

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