primary wire

例句：

1. 1. The primary wire in the power grid is responsible for transmitting electricity to homes and businesses.
   电网中的主线缆负责将电力传输到家庭和企业。
2. 2.The engineer carefully inspected the primary wire before installing the new system.
   工程师在安装新系统之前仔细检查了主线缆。
3. 3.In a power outage, the primary wire becomes the lifeline for essential services like water and gas.
   在停电期间，主线缆成为水和煤气等基本服务的生命线。