那时人们可选择的消遣方式很少。没有收音机，也没有电视。

People had very few amusements to choose from. There was no radio, or television.

《柯林斯英汉双解大词典》

我们调查了商务沟通顾问和礼仪专家，提供了以下指导，以有效地使用各种可选择的方式来传递麻烦的消息。

We've surveyed business communication consultants and etiquette experts to come up with the following guidelines for effectively using the alternative ways of delivering difficult messages.

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这个扩展中的标签域是可选择的。

The label field in this extension is optional.

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Maybe the disregard option just is one that we can't actually take on as an intellectually acceptable alternative.

也许选择无视只是一个,我们不能作为理性上可接受选项的选择。

耶鲁公开课 - 死亡课程节选

Selection sort too really reduces to a total number of comparisons because I'm again comparing the current smallest to the next thing I see, the next thing, so really a lot of these sorting algorithms boil down to comparisons and the numbers that you actually have to make.

选择排序也可归纳为总数的比较,因为要将当前最小者与下一个进行比较,接着再下一个，可见,很多排序算法都可归结为比较,以及需要比较的次数。

哈佛公开课 - 计算机科学课程节选

You have a freewill offering--just because someone wants to do this, a freewill offering. And you have a vow offering that would be offered on the successful completion of a vow, for example. And these sacrifices are all entirely optional.

自由祭品--只因为有人想这么干，自由祭品，还有一个誓言祭品,举个例子，一个誓言如果成功达成，便会供奉祭品，这些祭品都是可选择的。

耶鲁公开课 - 旧约导论课程节选