Ostwald's indicator theory

例句：

1. 1. This theory suggests that the speed of light is constant regardless of the distance traveled.
   这个理论表明光速是恒定的，不论距离有多远。
2. 2.The Ostwald's indicator theory has been widely applied in various fields, such as physics and chemistry.
   奥斯瓦尔德的指示器理论在物理学和化学等领域得到了广泛的应用。
3. 3. The theory was proposed by Ostwald in the early 20th century, and it has since become a cornerstone of modern thermodynamics.
   该理论由奥斯瓦尔德在20世纪初提出，并自那以后成为现代热力学的基础。