It is always optional to re-state any base interface in a partial class.
分布类中是否重新声明它所实现的接口也是可选的。
I'm not planning to get it, because like you said, music is optional.
我不打算得到它，因为像你说的，音乐是可选的。
It is important to keep in mind that these features are optional.
记住这些特性只是供选择的是很重要的。
You don't have to take this course , for it is optional .
你不一定非要修这门课，它是选修的。
This is an optional step, it depends on how you want your text to look.
这步可做可不做，做不做取决于你想让你的字体看上去是什么样子的。
It is completely optional for you to engage in these activities.
这是完全可选的你参与这些活动。
Is English an optional lesson, or does everyone have to learn it?
英语是选修课，还是每个人必修的课程?。
Optional: It is a good idea to make the object thread-safe.
可选择：让对象线程安全是个好主意。
Optional: It is a good idea to make the object thread-safe.
可选择：让对象线程安全是个好主意。
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