zero-signal zone

例句：

1. 1.The zero-signal zone is where the signal strength is at its lowest.
   零信号区是信号强度最低的区域。
2. 2.In the zero-signal zone, communication is severely limited.
   在零信号区，通信受到严重限制。
3. 3.The zero-signal zone is often used to describe areas where communication is difficult due to poor reception.
   零信号区通常用来描述由于接收不良而导致通信困难的区域。