matching conditions的用法和样例：
例句
- The time entanglement arises from the energy conservation in the down-conversion process,which is expressed by the frequency matching condition.
时间纠缠来源于下转换过程中的能量守恒，下转换过程可以通过频率匹配条件来表示。 - The quasi-phase-matched conditions of collinear and noncollinear optical parametric generator are analyzed and the deflection angle is achieved.
分析了共线和非共线光学参量产生器的准相位匹配条件，得出满足准相位匹配条件的光偏折角。
