通过测定土壤样品的重金属含量，调查了上海七宝镇污染水系两侧与上海宝钢集团厂区的重金属污染状况。
In this paper, the stream Banks nearby Qibao town and the factory area of Shanghai Baoshan Steel Company were selected as the typical areas contaminated by heavy metals.
贝京镇七月四日庆祝大会始于1830年。
The first Pekin Fourth of July celebration took place in 1830.
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