Above valve mouth in, pull out, give vent to anger door needle, set free to the limit;

气门嘴处于上方，拔出气门针，余气放尽；

youdao

Above valve mouth in, pull out, give vent to anger door needle, set free to the limit;

气门嘴处于上方，拔出气门针，余气放尽；

youdao