1 [T] demonstrate sth (to sb) to show sth clearly by giving proof 表明；论证；证明: Using this chart, I'd like to demonstrate to you what has happened to our sales. 我想用这张图表来向你说明我们的销售情况。

2 [I,T] demonstrate sth (to sb) to show and explain to sb how to do sth or how sth works 示范 · The crew demonstrated the use of lifejackets just after take-off. 乘务员在飞机起飞后即示范救生衣的使用方法。I'm not sure what you mean -- could you demonstrate? 我不大明白你的意思─你可否示范一下？

3 [I] demonstrate (against/for sb/sth) to take part in a public protest for or against sb/sth 示威；参加示威活动: Enormous crowds have been demonstrating against the government. 一直有大批群众举行反政府示威。