When my girlfriend rings me out of the blue, I'm in a good mood for the rest of the day.
我突然接到女朋友的电话,接下来的一整天我的心情都很好。
Although mankind has undergone no general improvement in intelligence or morality, it has made extraordinary progress in the accumulation of knowledge.
虽然人类有智力和道德上没有得到普遍提高,但在知识积累方面却取得了巨大的进步。