permanent deflection的用法和樣例：
例句
- A disturbance traveling through a medium by which energy is transferred from one particle of the medium to another without causing any permanent displacement of the medium itself.
波，振動(dòng)穿過(guò)介質(zhì)的振動(dòng)，通過(guò)振動(dòng)使能量從介質(zhì)的一個(gè)粒子傳送到另一個(gè)粒子而并不導致介質(zhì)本身的永久變位。
