n.额外的事物;另外收费的事物;(电影里的)临时演员,群众演员;
英文例句/中文翻译:
Take extra care on the roads this evening.
今晚在路上要格外小心。
The government has promised an extra £ 1 billion for health care.
政府承诺为医疗保健再拨款10亿英镑。
The conference is going to be a lot of extra work.
这次会议将意味着很多额外工作。