Riot police used tear gas to break up the demonstration.

防暴警察使用催泪瓦斯驱散了示威游行。

a cooking demonstration.

一次烹调展示。

demonstrations of new products.

新产品的展示。

It was an unprecedented demonstration of people power by the citizens of Moscow.

这是莫斯科市民对人民力量史无前例的证明。

This is a clear demonstration of how technology has changed.

这清楚地表明技术发生了怎样的变化。

There's been no public demonstration of opposition to the president.

还没有对总统的公开反对。