bunkers
A bunker is a place, usually underground, that has been built with strong walls to protect it against heavy gunfire and bombing.
an extensive network of fortified underground bunkers.
一个大范围的地下防御工事网络。
A bunker is a container for coal or other fuel.
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.
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。