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中文摘要：
本文研究了一类含四个有限奇点的实四次多项式微分系统，特别地，其中三个奇点是对称的．我们找到了奇点为等时中心（可线性化中心）的有效条件．
英文摘要：
In this paper, we investigate a class of real quartic polynomial differential systems with four finite critical points, where, in particular, three of which are symmetric. We search for effective conditions for the critical points in order to be isochronous centers （or linearizable centers）. We stress that few results are available concerning with several finite isochronous centers in a polynomial differential system of degree n, and our work is new and interesting.
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