underground main earthed electrode

例句：

1. 1. The underground main earthing electrode is crucial for the safety of the electrical system.
   地下主接地电极对于电气系统的安全至关重要。
2. 2. During construction, it's essential to ensure that the underground main earthing electrode is properly connected.
   在施工过程中，确保地下主接地电极正确连接至关重要。
3. 3. The underground main earthing electrode plays a vital role in preventing electromagnetic interference during data transmission.
   地下主接地电极在防止数据传输过程中的电磁干扰中起着重要作用。