慢速英语:Researchers: Link Between Zika Virus and Birth Defects

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短语讲解：

1. But because of its possible link to birth defects, experts believe it is a great danger to pregnant women.

because of 因为，由于
例句：John's jacket got out of shape because of the heavy rain.
约翰的夹克因为大雨而变形。

2. And it predicted that Zika could infect as many as 4 million people across the Americas this year.

as many as 和…一样多; 不下于
例句：They drew as many as four times that year.
他们那一年四次打成平局。