So you use the intercostal muscles, the muscles between your ribs, to bring air in and out of your lungs just by expanding and contracting your ribcage, and if I was to put a strap  around the outside of your chest called a breath belt, and just look  at that movement, you see a rather gentle sinusoidal movement, so that's breathing.
폐로 공기를 드나들게 합니다. 흉곽을 부풀렸다 줄였다 해서요. 가슴 바깥쪽에 호흡벨트라는  띠를 두르고 움직임을 살펴보시면 완만한 사인곡선 움직임을  보실텐데 그게 호흡입니다. 모두 하고 계시지요.