英语翻译请问:13年12月六级第二篇长对话1.He made his first notable achievement

英语翻译
请问:13年12月六级第二篇长对话1.He made his first notable achievement at age of 18 It was a method of refrigeration which rolls from his work in low temperature physics.这个句子里的roll是什么意思?
2.In 11920 he went to teach in New York and died there suddenly after only three weeks.Still he was a good age.a good age怎么翻译.是想说这个科学家去世得早,表达遗憾么?那英语中表达英年早逝的词或者短语有什么?
3.may as well与might as well有什么区别呢?
希望老师能解决我的疑惑,