Petschek 基本例句 n.佩切克 In this paper, the form of umbral dots of sunspot was satisfactorily explained by a mechanism of local perturbations in a magnetic tube of sunspot along with the theory of Petschek's neutral sheet. 本文假设在太阳黑子磁管内出现局部横向扰动磁场，然后利用中性片理论较为满意地解释了黑子本影点的形成。 cnki