Fathers are not optional, though.
然而父亲可不是可有可无的。
The integrity function is not optional.
完整性功能不是可选功能。
The relationship is also specified as not optional.
此关系也指定为不可选。
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。
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！
Vertex shaders are not optional.
顶点着色器是必选的。
Point to Ponder: Service is not optional.
思想要点：服事不是随你选择要或不要的。
Being diverse is not optional; it is what we must be.
我们认为多元化不是一种选择，而是一条必行之路。
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。
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。
Life is like a curve, starting point and the destination are not optional, but countless opportunities are between starting point and destination.
人生好似一条曲线，起点和终点是无可选择的，而起点和终点之间充满著无数个选择的机会。
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。
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。
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。
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