极涡是该区域四季存在、冬强夏弱、向上延伸至平流层下部的基本环流系统。
Polar vortex is a basic circulation system which exists in every season (strong in winter and weak in summer) and can extend to the lower level of stratosphere.
这些鸟能在脖极划冷的冬挽溜生存。
These birds able to survive the perils of the Arctic winter.
善养生者，食不过饱，饮不过多，冬不极温，夏不极凉。
Seventeen, good health, but eat food, drink but, winter is very warm, summer is not very cold.
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