For example, a newborn takes short and rapid breaths--about 40 per minute--but by the time the child is 18, the rate has gradually slowed down to about 18 breaths per minute.
以呼吸頻率為例，新生兒的呼吸又短又急促，每分鐘約 40 次，到成年時才降為 18 次左右。