minefield  
noun [ C ] uk/ˈmaɪn.fiːld/ us/ˈmaɪn.fiːld/
  (BOMBS)     
  雷区
an area of land or water that contains mines (= bombs)
   (PROBLEMS)      
 (雷区似的)危险形势;隐藏着问题和危险的事物
a situation or subject that is very complicated and full of hidden problems and dangers
  a legal minefield 法律上的雷区 
 a minefield of ethical problems 伦理问题的雷区