zài / fù biàn hán shù / zhōng / duō zhí hán shù / xū yào / jiè zhù / Lí màn qū miàn / lái / yán jiū

在复变函数中，多值函数需要借助黎曼曲面来研究。

In complex analysis, multivalued functions need to be studied with the help of Riemann surfaces.