/sɚˈkʌm.fɚ.əns/
the outside edge of an area or object that is round or curved, or the length of this edge
（圆形或弧形物体的）外周或外周长度
/sɚˈkʌm.fɚ.əns/
the outside edge of an area or object that is round or curved, or the length of this edge
（圆形或弧形物体的）外周或外周长度