extra/ˈekstrə/
adj., adv.特别的（地）；额外的（地）Can I have extra time to finish my work?我能有额外的时间来完成我的工作吗？
Then he smiled and told me I would receive an extra $100 a year!然后，他微笑着告诉我，我每年将得到一百镑额外收益。
Dinner costs $80, and wine is extra.饭菜是八十美元，酒费另收。
Children were extra glad to see the foreign visitors.孩子们见到外国客人高兴极了。