when: adv.1.〔疑问〕什么时候，几时。 W- did you see him (这以前)你几时见他的？2.〔关系，引导定语从句〕当…的时候。 He came at a time when I least expected him. 他在我最想不到的时候来了。3.从前境况差时。brag of having known sb. when 夸耀自己是某人过去的患难之交[布衣之交]。
According to roger lowenstein , the author of when genius failed , " the younger merton . . . showed a knack for devising systematic approaches to whatever he tackled 作为棒球爱好者和汽车爱好者，他先是特意背下了球员的击球平均数，后来又背下了几乎每种美国汽车的发动机规格。
