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短语讲解：
1. Experts say a woman who is infected during the early months of her pregnancy is at risk of giving birth to a baby with microcephaly.
give birth to 生（孩子），生育; 引起
例句：Though a mother give Birth to nine sons, all nine will be different
一娘养九子九子九个心。
2. Over 1,400 cases of the Zika virus have been reported in the U.S., according to the Centers for Disease Control.
according to 根据，按照
例句：According to her, grandfather called at noon.
据她说,祖父在中午打来电话。
3. The model took into consideration how an event called herd immunity can change the number of infections.
take into consideration 考虑到，顾及; 着想
例句：Time factor is what we must first take into consideration.
时间因素是我们必须首先考虑的。
4. Herd immunity happens when a disease or virus can no longer spread because so many people are infected.
no longer 不再，已不
例句：The mine is no longer being worked.
这座煤矿现在已不开采了。
5. Perkins is one of the researchers who took part in the study.
take part in 参与
例句：Are you going to take part in the first experiment?
你们会参与首次实验吗?
