noun 다운로드 🔗공유 윤활낭 Any of the many small fluid-filled sacs located at the point where a muscle or tendon slides across bone. These sacs serve to reduce friction between the two moving surfaces. Examples : "The runner's inflamed bursa made it painful to lift her arm. " 달리기의 염증이 생긴 윤활낭 때문에 그녀는 팔을 들어 올리는 것이 고통스러웠다. medicine physiology anatomy body organ AI와 채팅어휘 게임독해 연습