high-tension main

例句：

1. 1.The power grid is designed to handle the high-tension mains of modern homes.
   电网设计用来承受现代家庭高电压的主电源。
2. 2. In this system, the high-tension mains are connected directly to the transformer.
   在这个系统中，高压主电源直接连接到变压器。
3. 3. The technicians carefully checked the high-tension mains to ensure they were working properly.
   技术人员仔细检查了高压主电源，确保它们正常工作。