insure against

保护…免受危害, 防止, 防备
- You should insure against loss of heat by having double glazing.
  
  你应装双层玻璃以免散热。
- Vaccinations insure one against diseases.
  
  接种疫苗可以预防疾病。
- Proper clothing insured us against suffering from the cold.
  
  衣服穿得合适, 我们就不会挨冻。

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insure against

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