你不再说话，你的脚像铅一样拖着。
令人惊讶的是，钙的补充品中可能受到铅的污染，因为主要的钙补充品像海贝和牛骨都可能被污染。
Surprisingly, calcium supplements may be contaminated with lead, because the sources of calcium in supplements—like seashells or cow bones—are contaminated.
像布鲁克林和巴的摩这样的城市，是否应该采取措施将土壤里的铅全部清除掉呢？
Will cities like Brooklyn or Baltimore ever get around to removing all the lead in their soil?
应用推荐