snow不是可数名词，它的意思为“雪花”，属于物质名词，是不可数名词，没有复数。
In this area there is snow cover for six months of the year.
这个地区一年中有六个月被积雪覆盖。
Heavy snow has caused total chaos on the roads.
大雪导致道路上交通一片混乱。
The road is closed because of the snow.
这条路因下雪而封闭。
