The clouds can form alone, in clusters, or along acold front in a squall line.

这些云朵可以组成单独的云簇，也可以沿着暴风线的冷锋分布。

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A squall advancing along a front that forms a definite line.

沿锋面前进，形成了一条确定线的风暴。

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The squall line is a kind of instable and strong convective weather caused by the air with upper-layer dry and lower-layer wet in front of the upper-troposphere trough.

分析指出，该飑线系统是由高空槽前型的上干下湿引起的不稳定强对流天气。

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At the same moment, in a sudden squall, a white shape broke out in front of him from nowhere, or from between two parked cars.

NEWYORKER: The Swan