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1·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。

2·The stranger arrived at Bramblehurst railway station on acold, snowy day in February.

这个陌生人在二月份一个严寒的下雪天抵达布兰伯赫斯特火车站。