a mantle of white 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.
- The trees were clothed in a white mantle of frost.
- Nature did not forgot this remote, poor and uncultured village, covered fairly it a layer of white snow.
- Most children like to read the story of white snow princess and seven little scrubs.