The occurrence of squall lines is frequently associated with instability energy and vertical wind shear.

飑线的产生经常与不稳定能量和垂直风切变相联系。

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Meanwhile the vapor, dynamic condition and instability energy which play an important role in the heavy rain persistence were also discussed.

同时还探讨了水汽条件、动力条件及不稳定条件等因子在暴雨维持中的重要作用。

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The upper-level jet created the dynamic instability condition and the low-level jet played the vapour provider of the snowstorm and the trigger of convective instability energy release.

高空急流提供动力不稳定条件，低空急流是暴雪区水汽的提供者和对流不稳定能量释放的触发者；

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Still professing optimism, he said three huge problems could yet cloud our future: growing income inequality, too much political and economic instability, and an unsustainable energy regime.

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Dismal consumer confidence is cited as a source of concern, along with further commodity price instability - most notably the cost of energy.

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We continue to disagree with the U.S. slowdown forecasts based on rate hikes, expensive energy, a consumer slump, or broad instability related to a housing slowdown.

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