bunker

1. N-COUNT A bunker is a place, usually underground, that has been built with strong walls to protect it against heavy gunfire and bombing. 地堡

...an extensive network of fortified underground bunkers. …一个大范围的地下防御工事网络。

2. N-COUNT A bunker is a container for coal or other fuel. 燃料舱

3. N-COUNT On a golf course, a bunker is a large area filled with sand that is deliberately put there as an obstacle that golfers must try to avoid. (高尔夫球场的) 沙坑

He put his second shot in a bunker to the left of the green. 他把第二杆球打进了草地左边的沙坑。