real function

例句：

1. 1. The real function of this device is to improve efficiency.
   这个设备的真实功能是提高效率。
2. 2. The real function of the team is to support each other.
   团队的真正功能是相互支持。
3. 3. The real function of a computer is to process data.
   计算机的真正功能是处理数据。