discrete DCT离散DCT变换discreteadj.不连续的；分离的discrete spectral problem离散谱问题discrete word recognition离散字的识别discrete singular systems离散广义系统Discrete ordinates method离散纵标数值解法discrete potential theory离散位势论discrete curve on surface曲面上曲线discrete nonlinear system离散非线性系统discrete forcing approach离散力法Discrete - time - map离散迭代映射Discrete - time systems离散时间系统