Some doctors now think that the internal fat surrounding important organs like the heart or liver could be as dangerous as the external fat which can be noticed more easily.
一些医生现在认为，心脏或肝脏等重要器官周围的内部脂肪可能和更容易被发现的外部脂肪一样危险。
2
Since the lungs process air, they are the only internal organs that are constantly exposed to the external environment.
因为肺要处理空气，他们就变成了经常暴露在外部环境中的唯一的内脏器官了。
3
Dynamic means the external active state of human body and the internal active state of human organs and tissues.