extra /ˈekstrə/ I. adv.特别地；非常：work extra hard干活特别卖力 He was extra glad to see us.他看到我们高兴极了。‖II. adj.特别的；额外的：I must buy extra bread because friends are coming to tea.我必须再买些面包，因为朋友们要来吃茶点。［考句］In order to show his boss what a careful worker he was, he took extra trouble over the figures.为向老板证明他工作得多么仔细，在处理数据时他煞费苦心。‖III. n. ［c］额外的东西；号外；额外收费：The dinner cost 8 dollars without the extras. 饭是八元，没有额外收费。