The heart, so integral to life, sits in its protective cage in the chest, going about its work without any external sign to the owner.
원문출처 : https://www.cnn.com/2018/03/29/health/unusual-heart-disease-signs-partner/index.html
원문출처 : https://www.cnn.com/2018/03/29/health/unusual-heart-disease-signs-partner/index.html