This is because the developingnervous system is vulnerable to the toxic effects of lead, even at levels of exposure that do not cause obvious symptoms and signs.
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幼年接触铅可能会导致认知能力下降，诵读困难，注意力缺失症，以及反社会行为。
Lead exposure in early childhood can result in reduced cognitive abilities, dyslexia, attention deficit disorder and antisocial behaviour.
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接触铅还会导致高血压，肾功能损害，免疫毒性，以及生殖器官毒性。
Lead exposure can also cause anaemia, hypertension, renal impairment, immunotoxicity and toxicity to the reproductive organs.
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吸收大量铅可能会引起昏迷、抽搐，甚至死亡。
Absorption of large amounts of lead can cause coma, convulsions and even death.
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从严重铅中毒中恢复过来的儿童可能会留有永久性神经伤害问题，如失聪和智力低下。
Children who survive severe lead poisoning can be left with permanent neurological injury such as deafness and intellectual disability.