在孤立系统内，能量从一种形式（力学的、热学的、化学的等等）转变为另一种形式，一切形式的能量的总和保持不变。
When energy is changed from one form to another in an isolated system, there is no change in the total amount of energy.
在孤立系统内，能量从一种形式（力学的、热学的、化学的等等）转变为另一种形式，一切形式的能量的总和保持不变。
When energy is changed from one form to another in an isolated system, there is no change in the total amount of energy.
应用推荐