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.

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该组合具有冬性强、结球紧实、叶球淡绿色、叶肉厚、品质佳等特性。

Both of the new hybrids have the characters of strong winterness, compact bulb, greenish leaf, thick mesophyll and good quality.

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经2年冬性鉴定试验表明，冬甘2号甘蓝是适合保护地栽培的春甘蓝品种，具有早熟、丰产、优质、冬性强等特性。

Winterness of Donggan No. 2 was certificated in two years. The result showed that it's fit for planting in green house with characteristic of early mature, high yield and strong winterness.

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