we have a lot of stimulation in our lifestyles especially here in big cities like Los Angeles

我们的生活方式有很多刺激，特别是在洛杉矶这样的大城市，

瑜伽的魅力 - SpeakingMax英语口语达人

The general story of why we can't in general is because there's no surprise, there's no mock aggression, and also there may be a general deadening of self-stimulation.

为什么大部分人不能胳肢自己,是因为它在我们意料之内，没有打闹的侵略性，通常这种引自己笑的念头都会嘎然而止。

耶鲁公开课 - 心理学导论课程节选

One of the results of that stimulation is that B-cells - a particular subset of B-cells - gets activated.

这种激活的结果之一就是,B细胞,一类特别的B细胞亚族被激活

耶鲁公开课 - 生物医学工程探索课程节选