The system is a semi-closed loop system that knock sensor was used.

由于采用外部的爆震传感器，整个系统成为一个半闭环系统；

youdao

The system is a semi-closed loop system that knock sensor was used.

由于采用外部的爆震传感器，整个系统成为一个半闭环系统；

youdao