two male doctors examining human heart, heart health protection concept illustration. - 心室 幅插畫檔、美工圖案、卡通及圖標心型, 放大鏡, 心血管系統
history human anatomy, diagram of the heart, auricle, ventricle, pulmonary artery, vintage illustration, 19th century, victorian - 心室 幅插畫檔、美工圖案、卡通及圖標人體構造, 健保和醫療, 人體