But he was the first who ever did so by choice, out of principle.

但他确实第一个自愿这么做的人，这出于他自己做人的原则而已。

So, no, this is about fairness to the people who are childless by choice, okay?

所以，抱歉，我要对没有孩子的人公平，好么？

Why would we do it to ourselves by choice? !

什么我们会选择这样对自己？！

To refrain means that you stop yourself from doing something by choice.

“To refrain”指你自愿地阻止自己做某事。

Some students were more active than others but I suppose they were there by choice.

一些学生可能比其他学生积极，不过我认那因他们自己选择去那里学习的。

To have children by choice rather than chance is a matter of autonomy and dignity.

依靠选择，而非计划之外的怀孕，一个关乎自主和尊严的问题。

He was a non-conformist, although not necessarily by choice.

他一个不墨守成规的人，尽管不一定自愿的。

He said it should be by choice.

他说这自愿的。

By choice, he has no electricity, no gas, and no indoor plumbing.

他选择不使用电、煤气，也不安装室内管道。

Many people have become bilingual later in life either by choice or by necessity.

许多人选择或因需要而在成年后习得双语能力。

For example, I am bilingual and I am bilingual by choice.

例如，我个双语者，而且这我自愿选择的结果。

If you ever feel swamped by choices, I recommend trying this loop yourself.

如果你也感到被选择淹没，我建议你也尝试一下这个循环。

Unlike in high school and most of college, by choice. - Where's the opener?

跟在高中和大学时不一样，你们主动来的。 - 开瓶器在哪里？

Don't you dare say I'm in here by choice.

别说什么入狱我自己的选择。

Okay, I'm not here by choice.

我来这里并非自愿。

I have only a handful of highly meaningful relationships in my life and it is by choice.

我一生中只有少数非常有意义的关系，而这我的选择。

My mom, Nellie Ruth Pills-bury King, was one of America's early liberated women, but not by choice.

我的妈妈奈丽·露丝·皮尔斯伯里·金美国最早的妇女解放分子之一，却并非出于自愿。

I am an optimist by choice as much as by nature. Sure, I know that sorrow exists.

我乐天派，既天生如此，也因后天选择所致。诚然，我知道生命中会有伤痛。

It found that people tend to feel happier if they help others, but if they do so by choice.

研究发现，如果人们愿意帮助他人，而且出于自愿，他们往往会感到更快乐。

You know I wouldn't leave by choice, but it's time to draw a curtain over the past few months.

你知道我不愿离开的，但过去几个月的事拉下帷幕了。