To say that somebody does something alone means they do it not in the presence of others.

就是说人孤独而死的意思是,他们死的时候身边没有别人的存在。

耶鲁公开课 - 死亡课程节选

The difference between ratio is a reward every certain number of times somebody does something.

比率强化意思是,间隔一定比例才给予奖励。

耶鲁公开课 - 心理学导论课程节选

Does somebody want to say something?

有人想说些什么么？

麻省理工公开课 - 电影哲学课程节选