When snowfalls on high mountains or in polar regions, it may become part of the glacial system.

当雪落在高山或极地地区时，它可能成为冰川系统的一部分。

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High in the polar regions, the lines of magnetic force point almost straight upwards.

在极地的高空，磁力线几乎是垂直指向上方。

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It is the season for viewing Polar Mesospheric Clouds, and with our high beta-angle we were able to capture this thin layer of noctilucent clouds at sunset (6-25-2010).

到了观看极地中气层云的时候，在太空中使用高β角度，我们能捕捉到日落时刻这层薄薄的夜光云。

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The latest spacecraft was lifted by the Atlas into a 680km-high polar orbit.

BBC: Lift-off for latest Landsat mission

Dr Solomon discovered that chemical reactions destroy ozone on surfaces such as the ice crystals within high-altitude 'polar stratospheric clouds' as well as on other atmospheric particles high in the atmosphere.

BBC: News | Sci/Tech | Ozone hole reaches record size

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.

BBC: Volcano cloud threatens Formula 1 preparations