The lead poses little threat if undisturbed but "replacing old windows or drilling into walls to blow in insulation, for example, can contaminate the house with lead dust," CELA said.
2
重金属铅不是作物生长的必需元素，而是一种对作物有积累性危害的污染物质。
Lead is not a necessary element to crop growth but a pollutant with accumulation problems.
3
本文论述了环境铅污染与健康，包括污染物的来源、毒性危害和分析方法。
The article discusses on the relationship of environmental lead pollution and health, which covers pollutant sources, toxicity hazard and analysis method.
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