a mantle of snow的用法和样例：
- The mountain was covered with a mantle of snow.
- The whole city is in a mantle of dense mist.
- hills with a mantle of snow
- As the lakes and ponds freeze over, a thin mantle of snow covers the sedge.Occasionally a young and inquisitive arctic fox may be seen loping across the tundra.
- The valley was covered with a blanket of snow.