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例题 碘是人体必需的微量元素之一 ,碘的缺乏不仅会导致地方性甲状腺肿 ,也是导致人类智力障碍的主要原因。人常说 :“一代甲 ,二代傻 ,三代断根芽(即没有生育能力 )”。 1 990年 9月 ,71个国家的政府首脑在联合国签署了《90年代儿童生存、保护和发展世界宣言》和《行动计划》
Case Study Iodine is one of the essential trace elements in the body. The lack of iodine leads not only to endemic goiter, but also to the human brain. People often say: “One generation A, two generations of silly, three generations off the root bud (that is, no fertility)”. In September 990, the heads of government of 71 countries signed the “World Declaration on the Survival, Protection and Development of Children in the 1990s” and the “Action Plan” at the UN.