求翻译：城市是人类的中心场所，土壤在城市人居环境质量、城市生态功能等方面有着重要的作用，然而，频繁的人类活动使城市土壤遭受严重的重金属污染，因此，本文根据该问题，对城市表层土壤重金属进行了研究。是什么意思？

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The city is humanity's central place, the soil occupies aspects and so on environment quality, city ecology function in the city slicker has the vital role, however, the frequent humanity moves causes the city soil to suffer the serious heavy metal pollution, therefore, this article according to thi

City is the Center place for humans, environmental quality of soils in urban settlement, urban ecological function, has an important role, however, frequent heavy pollution of heavy metals caused by human activities in urban soils, so this article according to the issue, conducted a study on heavy m

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