本文研究了一类三次系统无穷远点的中心条件与赤道极限环分枝问题。
Studied in this paper are center conditions and bifurcation of limit cycles from the equator for a class of cubic polynomial system.
通过讨论初等多值函数的单值解析分枝问题，重点研究了初等多值函数在复变函数中的具体应用。
The multi-valued problems of elementary complex functions are discussed, and then the applications of general multi-valued functions in complex functions are discussed mainly.
不过问题是它们没法自然繁殖，于是有心人就截取了部分枝条嫁接到其他橙树上，希望生产出更多美味水果。
Since the new tree was unable to reproduce naturally, caretakers amputated some of its limbs and grafted them onto other citrus trees to produce more of the desirable fruit.
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