Pulmonary edema
Overview Pulmonary edema is a condition caused by excess fluid in the lungs. This fluid collects in the numerous air sacs in the lungs, making it difficult to breathe. In…
VOA英语教学网 - VOA LEARNING ENGLISH
一个让你免费在线学习VOA英语的好地方! 无须报名, 不收学费, 全年无休, 保证提高! (^_^)
Overview Pulmonary edema is a condition caused by excess fluid in the lungs. This fluid collects in the numerous air sacs in the lungs, making it difficult to breathe. In…