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雨夾雪
By the time they reached the top, the sleet had changed to fluffy snow.
當他們爬到山頂上的時候,雨夾雪已經變成了柔軟的雪花 。
2.Officials warned that while the worst of the storms has passed, travel conditions remain treacherous.
treacherous危險的
The current of the river is fast flowing and treacherous.
河水的水流湍急而且變化莫測 。