'Pb'是英语中的缩写，代表的是元素铅（Lead）的化学符号。铅是一种重金属，常见于矿物中，有毒性，可影响人体神经系统、免疫系统等。在工业生产中，铅常用于电池、管道等制造中，但由于其毒性，现在大部分国家已经开始限制铅的使用。
以下是含有'Pb'的9个例句：
1. The maximum allowable concentration of Pb in drinking water is 10 parts per billion.（在饮用水中Pb的最大允许浓度为10亿分之一）
2. The old house was painted with lead paint, which was found to contain high levels of Pb.（那所老房子上的油漆含有铅，检测结果显示Pb含量很高）
3. The company was fined for exceeding the emission limit of Pb from its factory.（该公司因超过工厂Pb排放限制而被罚款）
4. The blood test showed that the child had elevated levels of Pb.（血液检测显示该儿童Pb水平升高）
5. The laboratory analyzed the soil samples and found traces of Pb.（实验室分析土壤样品发现微量的Pb）
6. The children's toys were recalled due to the presence of Pb in the paint.（因玩具上的油漆中存在Pb，该儿童玩具被召回）
7. The use of Pb-free solder is becoming more common in electronic manufacturing.（使用无铅焊料在电子制造中越来越普遍）
8. The mining company was accused of contaminating the nearby river with Pb.（该矿业公司被指责将近邻河流污染为含Pb水体）
9. The government issued a ban on the sale of toys containing Pb.（政府发布禁令，禁止销售含有Pb的玩具）
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