The two principal officeholders wield enormous power.
这两个主要官员掌握着巨大的权力。
2
Power system use synchronous machines for generation of electricity, in other words, synchronous generators form the principal source of electric energy in power systems.
电力系统使用同步器来发电，换句话说，同步发电机是电力系统中电能的主要来源。
3
The agent is a substitute or deputy appointed by principal with power to do certain things which the principal could do.