nitrogen-sealed transformer

例句：

1. 1.The nitrogen-sealed transformer is an essential component in the power grid.
   氮封变压器是电网中不可或缺的组成部分。
2. 2.The engineers used a nitrogen-sealed transformer to improve the efficiency of the power system.
   工程师们使用了一个氮封变压器来提高电力系统的效率。
3. 3. The nitrogen-sealed transformer was designed to withstand high voltage and low frequency surges.
   氮封变压器被设计用来承受高压和低频浪涌。