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.
所以你用肋间肌， 也就是你肋骨之间的肌肉 来把空气吸入和排出肺部。 这是通过胸廓的舒张和收缩来完成的。 而如果我把一条呼吸带缠在你的胸膛 然后观察它的运动， 你会看到一个相当温和的正弦曲线运动， 而那就是呼吸的过程。