It ranges from sea level in the Polar Regions to 4,500 meters in the dry subtropics and 3,500-4,500 meters in the moist tropics.

它的范围包括海平面的极地地区、4500米高的干燥的亚热带地区以及3500-4500米高的潮湿的热带地区。

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It tends to snow a lot in the polar regions.

极地地区往往会下很多雪。

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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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Walsh spent eight years in academia. The retired Navy captain continued to pursue his passions as a scuba diver, private pilot and explorer, participating in dozens ocean dives and expeditions to the polar regions.

VOA: standard.2010.06.21

Medium-size M-class flares can cause brief radio blackouts in the polar regions and occasional minor radiation storms.

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In the polar regions, even the smallest of holes in your warm clothing can have major implications on your core temperature and survival.

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"Even though they seem far away, changes in the polar regions could have an impact on both hemispheres, with sea level rise and changes in climate patterns, " he said.

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