疟疾。世界约二亿六千万人尤其是儿童患疟疾。现在,专家研制用浸过杀虫剂网为蚊帐。它可以减少疟疾病人。
Labels: 浸过杀虫剤的蚊帐
posted by Tan Seng Giaw @ 11:45 PM
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