instead, snow melts during the day and freezes at night, producing an impenetrable layer of ice and depriving the lemmings of cold-weather habitat.

• 取而代之的是，冰雪白天融化晚上冻结，给旅鼠制造了一层不可穿越的冰层同时也夺去了他们生存的寒冷栖息地。