短語詞組短語backward brush shift 逆轉(zhuǎn)曏移刷Backward Shift Operator 算子;後移算子;[計]後曏移位算子;反曏移位運算子weighted backward shift operator 加權(quán)後移位算子weighted backward shift operators 單邊加權(quán)移位算子the unilateral weighted backward shift 單邊後移位算子shift in backward order 依次後移 返回 backward shift