气块法和稳定度简化条件：考虑一个小气块，假定它与环境之间无混合。
... conditional instability of the second kind 第二类条件（性）不稳定 conditionally unstable 条件性不稳定 conductive equilibrium 传导平衡 ...
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三是不稳定的空气状态。这是重要的局地热力条件。沙尘暴多发生于午后傍晚说明了局地热力条件的重要性。
Three is not stable air condition. This is an important local thermal conditions. Sandstorm occurs more often in the afternoon that incorporates the evening the importance of thermal condition.
分析表明：条件性对称不稳定是这次强降水发生的不稳定机制之一。
The analysis shows that conditional symmetric instability might be the unstable mechanism responsible for the heavy rain event.
用低杂波的可近性条件、参量不稳定性条件和功率耦合谱分析了低杂波电流驱动（LHCD）。
The conditions of wave accessibility and parameter decay instability are used to analyse the density limit in LHCD.
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