References(11) In this paper, by using Ahlfors' theory of covering surface, we study singular direction of meromorphic functions and their derivatives, which is a continuous research of Yang Lo in J. London Math. Soc. 25 (1982) 2: 288-296.
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机译：参考文献（11）本文利用Ahlfors的覆盖表面理论研究了亚纯函数及其导数的奇异方向，这是Yang Lo在J. London Math中的连续研究。 Soc。 25（1982）2：288-296。
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