上周末，他们帮助工人们清理公园。

They helped workers clean the park last weekend.

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本地医院也需要志愿者，老年人中的无家可归者和残疾人需要志愿者，清理公园也需要志愿者。

And volunteers are also needed in local hospital, old people's homeless people and disabled people or volunteer to clean up parks.

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例如，2002年，80万人清理了来自澳大利亚海滩、公园和街道的近1.5万吨垃圾。

In 2002, for example, 800,000 people cleaned up almost 15,000 tons of rubbish from Australia's beaches, parks and streets.

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