1. superposition principle of state 
   态叠加原理
2. law of superposition of strata 
   地层层序律
3. principle of velocity potential superposition 
   速度势叠加原理
4. A directive bearing the imprimatur of high officials. 
   高级官员批准的指示
5. The periodic variation in amplitude of a wave produced by the superposition of two waves of different frequencies. 
   波震动由两种不同频率的波叠加在一起而产生的波在某一区域内的周期振动

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