We call changes to internal system attributes internal changes.

我们称内部系统属性的变化是内部变化。

youdao

This is the maximum you can ever lose, and this is what we call the internal kinetic energy of the system.

这是可失去的最大能量，这就是我们所说的，系统内部动能。

youdao

Depending on what you call external and internal environment, this path that I'm tracing here, deep within your digestive system, is really directly connected to the outside world through both ends.

基于你们所谓的外环境和内环境,我在这里我所指的消化系统内部通路,它的两端确实与外界环境直接相通

耶鲁公开课 - 生物医学工程探索课程节选