black spot
noun [ C usually singular ] UK uk/ˈblæk ˌspɒt/ us/ˈblæk ˌspɑːt/
交通黑点，交通事故多发地段
a place on a road that is considered to be dangerous because several accidents have happened there
This corner is an accident black spot. 此拐角处是交通事故多发地。
不景气的地区;困难地区
a place where something is very bad
an unemployment black spot 失业率高的地区