below-zero temps 零度以下；frostbite 冻伤；英语里有一种来自澳大利亚的说法叫，one-dog night 意思是天气太冷，晚上要跟一条狗一起睡，取暖。再冷点就变成了 two-dog night, 特别冷的夜晚叫 three-dog night.

关于降温的几种说法：1. The temperature has dropped to X degrees. 气温已经下降到了X度（美国多用华氏度，华氏度(℉)=32+摄氏度(℃)×1.8）。2. It's below ... 气温在...以下。 3. It's turning colder. 天气在转冷