Brualdi RA and Liu Bolian. Generalized exponents of primitivedirected graphs. { J. of Graph Theory, 1990, 14: 483--499.是什么意思_Brualdi RA and Liu Bolian. Generalized exponents of primitivedirected graphs. { J. of Graph Theory, 1990, 14: 483--499.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句