HFU

例句：

1. 1. The HFU is responsible for monitoring the system's performance.
   HFU负责监测系统的性能。
2. 2. The HFU is used to control the flow of oil in the engine.
   HFU用于控制发动机中油的流动。
3. 3.The HFU is a critical component of the vehicle's powertrain system.
   HFU是车辆动力传动系统的关键环节。