diffusion path的用法和樣例：
例句
- Optical depth and optical path are often confused in the literature.
文獻中光學厚度和光程時常混淆。 - In a successful marriage ,there is no such thing as one's way,there is only one way for both ,only the bumpy,dusty,difficult,but always mutual path.
在成功的婚姻中，沒有誰自己的路的說法，有的只是兩個人的路，或許崎嶇不平，風塵滿程，困難重重，卻永遠是兩個人共同的路。
