bunker  
noun [ C ] uk/ˈbʌŋ.kər/ us/ˈbʌŋ.kɚ/
  (SHELTER)     
  掩体;地堡
a shelter, usually underground, that has strong walls to protect the people inside it from bullets or bombs
   (GOLF)     
 UK (US sand trap)(高尔夫球场上的)沙坑 
in golf, a hollow area of ground filled with sand, that is difficult to hit a ball out of