基本解釋[數(shù)學(xué)]幾乎非負(fù)詞組短語短語almost nonnegative Ricci curvature 幾乎非負(fù)Ricci曲率almost nonnegative更多詞組專業(yè)釋義數(shù)學(xué)幾乎非負(fù)