(b) According to current research, the only possible health risk is the use of a heavy metal such as lead or depleted uranium, which, in certain circumstances, can have harmful effects on the liver and kidneys.
(b) 根据目前的研究，对健康产生的唯一可能的风险是重金属（如铅或贫铀）的使用。 在一些情况下使用这些重金属会对肝和肾有害。