The demonstrators quieted down when the police arrived.

警察一到，示威者便安静了下来。

《牛津词典》

Police used tear gas to disperse the demonstrators.

警察动用了催泪瓦斯来驱散示威人群。

《柯林斯英汉双解大词典》

Police blasted the demonstrators with water cannons.

警察用高压水炮喷射示威者。

《牛津词典》

The demonstrators were protesting the war in Vietnam, racism and other issues.

VOA: special.2009.01.12

The demonstrators were kept away from the summit site by thousands of police, troops,helicopters, boats,tall fences and occasionally,tear gas.

VOA: standard.2009.09.25

The demonstrators were protesting laws that required them to carry pass books at all times or risk arrest.

VOA: standard.2010.03.21

The demonstrators say they will stay there until the factory is shut or moved.

ECONOMIST: Argentina and Uruguay

Shehehabi shot video that she said showed teargas and shotgun pellets being used on the demonstrators.

CNN: Funeral in Bahrain erupts in violence

The demonstrators said they resorted to the peaceful protest after their views were ignored.

BBC: University of Sussex student protest 'going strong'