碘131有八天的半衰期，这意味着每八天其能量就下降一半。
Iodine 131 has a half-life of eight days, meaning that every eight days it loses half its strength.
发育不良的原因有多种，但碘缺乏是罪魁祸首。
Stunting can have many causes, but iodine deficiency is a prime culprit.
在世界上几乎有三分之一的人不能从食物和水中摄取到足够的碘。
Almost one-third of the world's people don't get enough iodine from food and water.
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