That depends on how much sleep you get but dreams leave fragile memories. They fade quickly.

这要取决于你一晚睡多长时间,梦境会留下一些若有若无的记忆，而且很快会淡忘。

耶鲁公开课 - 心理学导论课程节选

It makes our life fragile, ephemeral, and as a result of that, more precious.

它让我们的生命脆弱，短暂，因此而更珍贵。

耶鲁公开课 - 死亡课程节选

There seems to be something to that and yet Hobbes certainly regards life as a precious good, perhaps the most precious good of all, and he writes with a lively sense of how fragile and endangered life is.

看起来有点关系,霍布斯肯定珍视生命，可能把它当作最珍贵的东西，他用一种活泼感写出,人生的脆弱和危险。

耶鲁公开课 - 政治哲学导论课程节选