他告诉我们，岩壁上白线的顶部显示冬季洪水涨到最高的水位。
The top line of white, he explained, shows how high the water gets during the flash floods in winter.
冬季风暴预警及警示已在数州发布，南加州的某些地区则在大雨后发布洪水警报。
Winter storm warnings and advisories are in effect for parts of several states, while some areas in southern California are under flood warnings after heavy rains.
这种灾难不只发生在洪水泛滥地区，也不只发生在冬季。
Disasters of this sort were confined to neither traditionally flooded land nor the winter months.
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