The only child is often most comfortable when alone.

独生子女在独处时往往最自在。

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The brains of teenagers, but not adults, showed greater activity in two regions associated with rewards when they were being observed by same-age peers than when alone.

青少年在被同龄的人观察时，大脑中两个与奖励相关的区域比独处时表现出更剧烈的活动，成年人则不然。

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He alone, of all those around the president, would argue with Grant when he believed him to be wrong.

VOA: special.2010.02.11

When people say,You know,everyone dies alone, you're supposed to be gaining some deep insight into the nature of death.

当人们说，每个人都孤独而死，这应该让你得到对死亡本质的深刻认识。

耶鲁公开课 - 死亡课程节选

So,all this is,is just,as we begin to ask ourselves, what could it possible mean when people say everyone dies alone?

所以我们要开始问自己，人们说他们孤独而死的时候是什么意思？

耶鲁公开课 - 死亡课程节选

Another asked about eating habits, including questions on how often the volunteer dieted, how much time she spent thinking about food and whether she ate sensibly in front of others only to splurge when alone.

ECONOMIST: One reason dieting does not work

Sometimes when alone and thinking or struggling to turn a matter over to Jesus Christ in prayer, he would find himself putting his fist in his palm and turning it slightly as if still playing and pounding his glove to stay sharp and alert in center.

NEWYORKER: Good People

Nor does empathy suggest a physiological "reason" for yawning (after all, we yawn when alone), though Dr. Provine thinks that it may be "a response to and facilitator of change in behavioral or physiological state, " maybe synchronizing a group of people about to embark on a behavioral transition.

WSJ: Matt Ridley on Why You Just Yawned | Mind & Matter