polar anemia

例句：

1. 1. The polar region is home to some of the rarest and most endangered species on Earth.
   极地地区是地球上一些最稀有和最濒危物种的家园。
2. 2.Due to the extreme cold temperatures in the polar regions, it's crucial for scientists to monitor the health of these animals.
   由于极地地区的极端低温，科学家必须监测这些动物的健康。
3. 3. In polar anemia, the body struggles to produce enough red blood cells to carry oxygen throughout the body.
   在极地贫血症中，身体努力产生足够的红细胞来输送体内的氧气。