dead zone
noun [ C ] uk/ˈded ˌzəʊn/ us/ˈded ˌzoʊn/
无信号区（移动电话因无信号而无法使用）
a place where a mobile phone does not work because there is no signal
无事发生的时间（或地点）
a place or time in which nothing happens
The village is a dead zone for many young people. 对许多年轻人来说，这村落是与世隔绝的。