Even though it is quite cold, the combination of sunshine and some wind can make a thin crust of extremely slippery ice on the top layer of what is usually just snow.

• 虽然气候还是非常寒冷的，但由于阳光和风的交替作用，使得顶层的积雪形成了一个较硬的但却是极其滑溜的薄薄的表层。