On January 31 , a musher named Seppala had to cross a frozen body of water called Norton Sound .
1月31日,一名叫塞帕拉的狗拉雪橇驾驶者必须要穿过一个名为诺顿湾的冰冻水体。
Norton Sound was covered with ice , which could sometimes break up without warning .
诺顿桑德身上覆盖着冰,这些冰有时会毫无征兆地破裂。