no-go area

1. N-COUNT If you refer to a place as a no-go area, you mean that it has a reputation for violence and crime which makes people frightened to go there. 禁区; 危险区

...a subway system whose reputation for violence and lawlessness makes it a no-go area for many natives of the city. ...一个以暴力和无法无天而闻名的地铁系统，被本市很多市民视为禁区。

2. N-COUNT A no-go area is a place which is controlled by a group of people who use force to prevent other people from entering it. (用武力控制进入的)地区

The area of the president's residence is a no-go area after six p.m. 总统官邸区下午六点钟后禁止进入。