All of the additional parameters are optional so you specify only as much information as you want.

所有其它参数都是可选的，因此您只指定您想要的信息便可。

youdao

So it's optional whether the less-derived implemented interfaces are stated in the base type list?

那么就是说派生程度较低的接口是否被声明在基类列表中是可选的了？

youdao

Most of these fields are optional, so your package will not have to include every field described here if they aren't relevant to your package.

这些字段中的大多数都是可选的，因此如果有某些字段与您的软件包无关，那么您的软件包就无须包含所有这些字段。

youdao

I want to just go over the requirements of the course that really are required, not the optional piece, just so that you understand what my purpose is pedagogically.

我只想跟大家回顾一下,这门课程的必须要求，并非可以自由选择的,这样你们会理解我的目的何在。

耶鲁公开课 - 1945年后的美国小说课程节选

So they're optional, but they're very, very, very highly encouraged that you do these, because this is going to give you practice for the types of problems that are going to be on the exam.

虽然它们是选做的，但是它们非常非常，非常值得你们去做，因为这对你们来说是一次训练,是用来熟悉考试题型的。

麻省理工公开课 - 化学原理课程节选

So I'm not suggesting that it's an optional problem set that you shouldn't do.

一个可做可不做的问题集,因为不做它你会后悔的。

麻省理工公开课 - 计算机科学及编程导论课程节选

"Everything was optional, so a lot of people just sat around and talked about losing weight, " she says.

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These models come with Ultrabook innards starting with low-voltage versions of the Core i5 and the NVIDIA 630M, and they also come with HDMI-in and optional TV tuners so they can be used in a living room or kitchen situation.

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So why not make state regulation optional?

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