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1.Thousands remained without power across the southeastern United States after a massive winter storm dropped snow, sleet and freezing rain on five states.
sleet雨夹雪
By the time they reached the top, the sleet had changed to fluffy snow.
当他们爬到山顶上的时候，雨夹雪已经变成了柔软的雪花。
2.Officials warned that while the worst of the storms has passed, travel conditions remain treacherous.
treacherous危险的
The current of the river is fast flowing and treacherous.
河水的水流湍急而且变化莫测。
