波罗洲

例句：

1. 1. The cruise ship sailed through the vast expanse of the Boreal Sea.
   这艘游轮穿越了广阔的北冰洋。
2. 2. The explorers discovered a new species in the Boreal region.
   探险队在北极地区发现了一种新的物种。
3. 3. The Boreal season is when the trees turn their leaves, and the air is crisp and cool.
   北极季节是当树木换叶，空气清新凉爽的时候。