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 。