VOA慢速英语2014.05.26 female, increase, necessary, reduce, 英语

Rebecca949

The treated nets block female mosquitoes from securing blood, which is necessary for them to reproduce. The insecticide also cuts the life of the insects in half.处理过的蚊帐可以防止雌性蚊子吸血,这是它们繁殖的必要条件.杀虫剂也将这些蚊虫的寿命缩减了一半.
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jessica-tang

if we can