以下为句子列表：
英文: But with the in cidence of dental caries alone standing at 60 percent to 90 percent for school children in many countries, and with this figure predicted to increase in developing countries in particular, the world is facing a huge challenge.
中文: 但不幸的是，在许多国家，光是龋病的发生率就在中小学生中占到60%至90%，而且，在发展中国家，这一数字据预测还要继续升高，形势非常严峻。
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