discontinuity object的用法和样例：
例句
- An element means that stress discontinuity from one element to the next are inevitable.
意味着一个单元与近旁单元的应力不连续是不可避免的。 - When light encounters an optical discontinuity, like an impurity in the glass or a micro-fracture, some of the light signal is reflected back in the opposite direction.
当光线遇到光学不连续，像在玻璃上的不纯物或微小的裂缝，某些光线讯号会以相反方向反射回去。
