coldness of extremities

例句：

1. 1. The winter weather has brought a lot of people to the hospital for treatment of coldness.
   冬天的天气让很多人因为寒冷而去医院治疗。
2. 2.He was so cold that he couldn't feel his fingers.
   他太冷了，以至于感觉不到自己的手指。
3. 3. The coldness of the air made it hard for him to breathe.
   空气中的寒冷让他呼吸困难。