unprotected [ˌʌnprəˈtɛktɪd]

例句:

• "Unprotected, unhedged, incautious and reckless".
  来自THETIMES
• The long and mountainous joint border is largely unprotected.
  来自THETIMES
• This leaves fertile soil unprotected and prone to erosion.
  这会让肥沃的土壤暴露在外，使其容易受到侵蚀。
  
• You are playing Russian roulette every time you have unprotected sex.
  行房时不采取避孕措施是非常危险的。
  
• The landing beaches would be unprotected.
  登陆的海滩可能没有设防。
  
• Fertilisation will only occur if there has been unprotected sex.
  来自BBC