subzero [ˌsʌb'zɪroʊ]

例句:

• Tumor cells are not uniquely susceptible to damage by subzero freezing.
  肿瘤细胞不是唯一容易被低温所冷冻的细胞.
  
• There is often subzero temperature in winter here.
  这里的冬季的气温往往在零度以下.
  
• In some parts of United States and Russia, the winter season brings subzero temperatures.
  在美国及俄罗斯部份地区, 冬季的温度都降到零度以下.