美媒解读第二波疫情风险：从哪来？怎么防？_BEC初级作文

美媒解读第二波疫情风险：从哪来？怎么防？

What often happens is that a novel variant of flu virus spreads around the world and then recedes, kind of like a tsunami. A few months later, it comes back and spreads around the world, or large parts of it, again.

经常发生的情况是，流感病毒的新变异株在世界各地扩散，然后消退，有点像海啸。几个月后，它卷土重来，再次在世界各地或大部分地区扩散。

2.What makes the first wave recede?

是什么让第一波疫情消退？

Influenza pandemics can be temporarily beaten back by the change of seasons, moving to the southern hemisphere when the northern half of the globe heats up during its summer, and vice versa. The virus may also have infected a huge portion of people in most areas, giving them immunity from re-infection and possibly creating so-called herd immunity, which protects those who haven’t been infected by curtailing the virus’s circulation.

流感大流行可能会被季节变化暂时击退，在北半球夏季升温时转移到南半球，然后再反过来。这种病毒还可能在大多数地区感染大量人口，使他们形成免疫，不会再次感染，可能会形成所谓的群体免疫，由此减少病毒传播来保护尚未感染的人。

In the case of the coronavirus that causes Covid-19, countries around the world have adopted movement restrictions on an uNPRecedented scale and social-distancing measures that together keep people far enough apart so that the virus can’t easily spread.