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N-COUNT
（通常建于地下的）掩体；地堡
A bunker is a place, usually underground, that has been built with strong walls to protect it against heavy gunfire and bombing.
例句
...an extensive network of fortified underground bunkers.
四通八达的地下防御工事
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N-COUNT
煤箱；燃料箱
A bunker is a container for coal or other fuel.
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N-COUNT
（高尔夫球场上的）沙坑
On a golf course, a bunker is a large area filled with sand, which is deliberately put there as an obstacle that golfers must try to avoid.
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VERB
（高尔夫球运动中）把球击入沙坑
In golf, if you bunker a shot, you hit your ball into the bunker.
例句
She bunkered her second shot.
她第二次击球把球打进了沙坑。