当粒子或其他东西，通过辐射或粒子的方式，并且能量高于临界值，撞击到硫化锌的表面上的时候，就会发光。

And, when zinc sulfide is hit by particles or by anything, by radiation or by particles of greater than a certain critical energy, there is a glow.

youdao

给出了当初始能量小于“临界值”时方程解的生命跨度的上界估计。

And the super estimate of this lifespan is given when the initial energy of this equation is less than "critical value".

youdao

当激光能量密度低于某一临界值时，点火延迟时间随激光能量密度的提高而线性变短，然而激光能量密度超过该临界值后，激光点火延迟时间保持恒定。

The delay time of ignition is shorted with the rise of the energy density of laser linearly, but when the energy density increases over a critical value, the delay time keeps constant.

youdao

And, when zinc sulfide is hit by particles or by anything, by radiation or by particles of greater than a certain critical energy, there is a glow.

当粒子或其他东西,通过辐射或粒子的方式，并且能量高于临界值,撞击到硫化锌的表面上的时候，就会发光。

麻省理工公开课 - 固态化学导论课程节选