B power supply

例句：

1. 1. The hospital's main power supply is coming from the grid.
   医院的主电源来自电网。
2. 2. The new power supply station is expected to be operational within a year.
   新的供电站预计一年内投入运营。
3. 3. The power supply company has been providing reliable energy for decades.
   这家电力公司几十年来一直提供可靠的能源。