mercury cathode

例句：

1. 1. The mercury cathode is used in the electrolysis of water.
   水银阴极用于水的电解。
2. 2.The mercury cathode is a crucial component in the production of radioactive isotopes.
   水银阴极是生产放射性同位素的关键组件。
3. 3.The mercury cathode was replaced by a more efficient material in recent years.
   近年来，水银阴极被一种更高效的材料所取代。