An organ is a part of your body that has a particular purpose or function, for example, your heart or lungs. 器官
noun [专属名词] （人体或动植物的）器官；阴茎，阳物；风琴，管风琴；<正式> （官方的）机构，机关；<正式>机关报刊，宣传工具
The largest organ in the body is the liver. 体内最大的器官是肝脏。
