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。
In iterative development, this is much like substituting one optional feature for another as we continually learn about our project and our customer needs.
在迭代开发中，这类似于随着我们不断地了解我们的项目和客户的需求，用一个可选特性来替代另一个。
I don't like to be dogmatic about things, but this part is not optional.
我这不是搞教条，在这个问题上，其实别无选择。
The latter one which is about the manipulation of computer is optional but must be included in the final test.
第二部分关于计算机操作，属于选修但其摸考试包括这部分。
Gym Membership This is optional. A lady is judged more by her attitude than her physique, and lady feels great about herself no matter what her shape.
健身俱乐部会员资格这个可有可无。评判淑女取决于态度而不是外表，不管自己是怎样的外表淑女都会感觉不错。
The method of minimum overall cost is one of the optional methods that are used for techno-economic analysis about the many kinds of equipment renewal modes.
在对多种更新方式进行技术经济分析时，可选的方法之一是最低总费用法。
The method of minimum overall cost is one of the optional methods that are used for techno-economic analysis about the many kinds of equipment renewal modes.
在对多种更新方式进行技术经济分析时，可选的方法之一是最低总费用法。
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