Vertex shaders are not optional.
顶点着色器是必选的。
Fathers are not optional, though.
然而父亲可不是可有可无的。
If V6.0 and earlier, this is not optional.
如果是V6.0和更高版本，则不是可选的。
The integrity function is not optional.
完整性功能不是可选功能。
Point to Ponder: Service is not optional.
思想要点：服事不是随你选择要或不要的。
The relationship is also specified as not optional.
此关系也指定为不可选。
For unsecured peer names, the classifier is not optional.
对于不安全的对等名称，分类器不是可选的。
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。
Not optional. You'll be glad as the savings grows, and especially when emergencies come up.
不随意，你将很开心看到储蓄增长，特别是当紧急情况发生时。
For a use case like the one in this article, this parameter is not optional—it is critical!
对于和本文类似的用例，该参数是不可选的 —这至关重要！
These are not optional skills in life, so attending classes should not be optional in college.
这些都是生活必备的技能，所以不应该在大学上课是可选的。
For SOA to be successful, SOA business and technical governance is not optional, it is required.
对于SOA的成功，SOA业务和技术治理不是可选的，而是必须使用的手段。
You must provide values for all arguments that are not optional, and you must enclose the argument list in parentheses.
您必须提供所有非可选参数的值，并且必须用括号将参数列表括起来。
You can ensure that SSL is used for IIOP by indicating that it is required, and not optional, on the CSIv2 inbound transport panel.
可以通过在CSlv2入站传输面板中指明SSL是必需而不是可选的，从而确保对IIOP使用 SSL。
Clearly, a Disaster Recovery plan is not optional even in the Cloud, and Architecture is and will remain essential for building Cloud-based solutions, this is not new.
很明显，就算在云端，灾难恢复计划也是必须的，架构无论现在还是以后，都会是构建基于云的解决方案的必备内容，这并不是什么新鲜观点。
It is worth mentioning that there are not optional components and that the following technologies must be implemented fully for a solution to conform with the Web profile.
值得注意的是，Web Profile并没有什么可选组件，要想实现符合Web Profile的解决方案就必须实现如下这些技术？
To this way of thinking, to guarantee a comfortable retirement is akin to banning child labour or giving women the vote: not optional perks, but badges of a civilised society.
这样想来，为确保退休无忧和禁止使用童工或是赋予妇女投票权有着相似的意义：不是选择性的津贴，而是文明社会的标志。
Although adherence to the aspirational standards is not easily measured, conducting ourselves in accordance with these is an expectation that we have of ourselves as professionals-it is not optional.
虽然符合共识性准则的标准不太容易衡量，但职业行为符合这些准则并不是可有可无的，而是作为专业人士所被期望遵循的。
By setting Peking Opera as an optional course, students may have more freedom to decide whether to take it or not.
通过将京剧设置为选修课，学生们可以有更多的自由决定是否选修京剧。
If the overall data entry is optional, however, then validation need not occur.
不过，如果整个数据项是可选的，那么就不需要进行验证。
Each parameter has a field that specified the type of parameter that can be input, and another that specifies whether the parameter is optional or not.
每个参数包含两个字段，一个指定可以输入的参数类型，另一个指定参数是否为可选。
As far as I am concerned the use of stored procedures, database triggers and foreign key restraints is OPTIONAL, not MANDATORY, therefore I am free to exercise my option not to use them.
这样的话，我认为存储过程，触发器，外键是可选的，而不是强迫的，因此我可以自由的选择不去用它们。
There are also a number of other optional arguments not discussed in this article.
还有很多本文中没有讨论的选项参数。
Optional, you can decide not to have Web link at all.
可以选择不用Web链接。
However, this is an optional value and is not required for actually displaying the event on a calendar.
不过，这是一个可选值，当实际在日程表上显示事件时这不是必需的。
It is not an error (because the declaration is optional), but it might be worth noting.
它不是错误(因为声明是可选的)，但是它可能值得注意。
It is not an error (because the declaration is optional), but it might be worth noting.
它不是错误(因为声明是可选的)，但是它可能值得注意。
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