基本解释貝蒂數词组短语短語Betti deficiency number Betti 虧數graded Betti number 分次Betti數The first Betti number 第一Betti數Betti de ciency number Betti 虧數betti number of riemannian manifold 黎曼流形的貝蒂數betti number更多词组专业释义數學貝蒂數