On Wednesday, a polar wind brought bitter cold to the Midwest.

周三，一股极地风给中西部地区带来了刺骨的严寒。

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The resulting stream of charged particles, called the polar wind (not to be confused with the planetary wind), accounts for 10 to 15 percent of Earth's hydrogen loss and almost its entire helium leak.

由此形成的带电粒子流，就叫做“极地风”(polar wind)，可占地球氢元素泄漏过程的10 ~ 15%，而几乎所有的氦气就是以这种方式脱离地球的。

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This image shows part of a polar crater that still holds on to some summer ice, as well as beautiful sand dunes sculpted by the wind.

这张照片展示了某个极地陨坑，陨坑中还保存着一些夏季冰的痕迹，在风的作用下形成了一些美丽的沙丘。

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Usually, the prevailing south-westerly wind would take the ash cloud away from Europe and over the polar region, but a high-pressure area is bringing it over Europe, where it is sitting and barely moving as the ash spreads.

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In Asbury Park, New Jersey, a traditional polar bear club plunge into frigid waters had to be postponed because of the single-digit wind chill.

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