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登革热的危险性却鲜为人知。因此，人们需要时时谨慎，尽量防止蚊虫在自家周围滋生。

与其常见的喷蚊雾来解决，威省市议员陈润辉和慈济志工陈飞旺都利用大自然生态中的食物链来应付过多的蚊子。他们是怎样办到的呢？