短语词组短语spectral sparseness 频谱稀疏性sparseness sparsity 稀疏population sparseness 人口过疏sparseness representation 稀疏表达channel sparseness 信道的稀疏性fuzzy sparseness 模糊稀疏度data sparseness 数据稀疏;数据稀疏问题;料稀疏;资料稀疏lifetime sparseness 时间维稀疏性 返回 sparseness