1. Fourier analysis in discrete time system 
   离散时间系统的傅里叶分析
2. Fourier transform of nonperiodic discrete-time sequences 
   离散时间非周期序列的傅里叶变换
3. discrete Fourier series representation of discrete-time periodic sequences 
   离散时间周期序列的离散傅里叶级数表示
4. possibility of expand trade 
   扩大业务的可能性
5. To expand domestic demand 
   扩大内需

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• 1. 傅里叶展开
  Fourier decomposition 傅里叶分解; 傅里叶分解...fourier expand 傅里叶展开...Fourier expansion 傅里叶级数展开
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