Fermat rs principle的用法和樣例：
例句
- Fermat's principle is not so much a computational device as it is a concise way of thinking about the propagation of light.
費馬原理更多的是對光的傳播的一種簡(jiǎn)明看法，而不是一種計算工具。 - The paper is to prove the refraction on two kinds of medium interfaces of electric displacement line using the boundary condition of the electric field and Fermat Principle.
利用電場(chǎng)邊界條件和費馬原理證明電位移線(xiàn)在兩種介質(zhì)界面上的折射。
