metal-tank mercury-arc rectifier

例句：

1. 1.The metal tank is used to store and transport liquids.
   这个金属水箱用于储存和运输液体。
2. 2. The mercury-arc rectifier is a crucial component in the power grid.
   汞弧整流器是电网中至关重要的组件。
3. 3.The metal tank was damaged during the flood, requiring repair.
   洪水期间，金属水箱受损，需要修理。