Some pair programmers regard rotation as an optional part of the practice, and on a small team, or with few programmers willing to pair, there might be little alternative.
有些结对编程者认为轮换是实践中可选的部分，而且在小型团队或者是没有几个程序员愿意结对的团队中，可能没有其它的选择。
This information is optional, but it's good practice to supply an email address if people want to reach you about the project.
这些信息是可选的，但提供电子邮件地址是比较实际的做法，因为人们可能希望与您取得联系。
The current practice of allowing candidates to register for an exam without purchasing the curriculum sends the wrong message that studying the curriculum is optional.
目前的做法允许候选人参加考试而无需购买教材，这传达了教材可有可无的错误信息。
The current practice of allowing candidates to register for an exam without purchasing the curriculum sends the wrong message that studying the curriculum is optional.
目前的做法允许候选人参加考试而无需购买教材，这传达了教材可有可无的错误信息。
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