Others believe that going to classes should be optional for students.
另一些人认为学生应该可以选择去不去上课。
In the new curriculum, some courses are compulsory, while others are optional for middle school students.
在新课程中，一些课程是必修课，而另一些是中学生的选修课。
KeyInfo is optional for two reasons.
KeyInfo是选择性的有两个原因。
Programs and tourist routes are optional for each group.
各团体可根据实际情况选择不同时间的课程及旅游线路；
It also makes XML-based deployment descriptors optional for application packages.
它还使得基于XML的部署描述符成为应用程序包的可选组件。
The schema for would have all account and product elements optional for all messages.
的模式中必须包含全部的帐目和产品元素，以供所有的消息选择使用。
Making semicolons optional for some rules while keeping the trailing semicolon optional?
制定一些规则可选分号同时保持分号结尾的可选？
These are optional for NIA members and are a great way to meet other members on the program.
对于NIA会员，这个是义务的，并且是与其他会员见面的很好途径。
Support for this attribute is optional for XForms processors, so many renderers do not support it.
对于X Forms处理器来说，对这个属性的支持是可选的，所以很多呈现程序都不支持这个属性。
Support for this axis becomes optional for 2.0, except that BC mode requires that it be supported.
中对该轴的支持是可选的，不过BC模式要求支持它。
Optional for hard and soft brusher device, which is special design for hard LOW-E glass washing.
可加装软硬毛刷清洗选择装置(选购件)，适合对硬low - E玻璃的清洗。
Enable reliability even on one-way calls. Use of ordered delivery is optional for one way calls.
即使当单向调用的时候，也要启用可靠性。单向调用不必使用有序传递。
The message part name is mandatory for interface typed variables, and optional for data typed variables.
消息部分的名称对于接口类型的变量是必需的，对于数据类型的变量是可选的。
The specifications of data elements that are required and optional for a valid exchange (the cardinality)?
指定对于有效的交换，哪些数据元素是必需的，哪些是可选的(基数)？
An Intrinsic Safety Barrier is optional for sensor and cable installation in hazardous rated locations.
内在的安全屏障是可选的传感器和电缆额定危险地点安装。
Note this selection is purely optional for visual purposes only, and is a matter of personal preference.
请注意此选择纯粹是为了视觉目的的选择，是个人喜好的问题。
Grace and athletic ism are optional for males in human courtship but both are mandatory in manakin courting.
人类在追求异性时健壮和优雅也可以加分；但在侏儒鸟群里这两者可都是必须的手段。
Last week, Efficient Frontier, a digital marketing company, acquired Context Optional for an undisclosed sum.
上周，一家数码营销公司EfficientFrontier收购了ContextOptional，价格不明。
Check the vendor documentation to see if the 2.0 processor supports the namespace axis because support has become optional for 2.0.
查看供应商文档了解2.0处理程序是否支持命名空间轴，因为在2.0中是可选的特性。
Some people believe that university students should be required to attend classes. Others believe that going to classes should be optional for students.
有的人认为大学生应按要求上课，而有的人认为大学生应自行选课。你的看法是？给出原因和具体例子。
Topics of the course are listed below. The "lab sessions" are mandatory for students traveling on the MIT India program, but optional for other students.
下列为课程所涉课题。赴印度参加麻省理工学院印度项目的学生必须修读“实验课程”，其他学生可选择参加。
Lots of developers seem to think that testing is optional for large swaths of their code, but any code that makes changes to existing classes requires comprehensive testing.
许多开发人员认为他们的大量代码可以选择测试，但是修改现有类的任何代码都需要综合测试。
These characteristics can be found in requirements and SOA solutions in various organizations today, although these characteristics are optional for SOA and mandatory for cloud.
这些特征可在当今很多组织的SOA解决方案及需求中找到，只不过在SOA中它们是可选的，而在云计算中它们是必需的。
You made this element optional for backward compatibility, but you'll notice that the optionality of this field is a good idea anyway, because not all addresses have apartment Numbers.
您可以使这个元素为向后兼容的可选项，您会发现这个字段的这个可选性是一个很不错的主意，因为并不是所有的地址都有房间号码。
You may recall from Part 1 that the UUID is mandatory and the service name is optional for all Bluetooth servers; however, we specified that the service name for our service would be "FTP."
您可能从第1部分回忆起来，对于所有的蓝牙服务器来说，UUID是必需的，服务名称是可选的；但是，我们为服务指定的服务名称是“FTP”。
Somewhere along the line, holiday tipping went from an optional thank-you for a year of services to a Mafia-style protection racket.
一路走来，节日小费从对一年的服务表示感谢的选择变成了黑社会性质的勒索保护费。
Like a cascading style sheet, this type of processing instruction is optional, even for a transformation tool.
与级联样式表相似，这种类型的处理指令是可选的，甚至对于转换工具来说也是这样。
But I'm not part of the truly rich for whom taxes are optional, and for whom ever-increasing property prices are a source of entrenching their wealth.
但我不属于那些真正的富人，对他们来说税金是可选择的(随意的)，不断增长的房地产价格是他们巩固财富的源泉之一。
But I'm not part of the truly rich for whom taxes are optional, and for whom ever-increasing property prices are a source of entrenching their wealth.
但我不属于那些真正的富人，对他们来说税金是可选择的(随意的)，不断增长的房地产价格是他们巩固财富的源泉之一。
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