Halina searched the classifieds for dance classes .

海莲娜从分类广告中寻找舞蹈课程。

This also gives a posi - tive answer to Puczylowski ' s and Roszkowska ' s question like Halina But unfortunate - ly , the author is unable to build or find such a ring R that π _R and H_R contain no prime simple rings and () - rings , where π _R and H_R are , resp . , the smallest special class containing R and the homomorphic closure of { R } .

这也和Halina〔2〕一样对Puezylowski和Poszkowska提出的问题〔1〕给出一个肯定的回答。但是，不幸的作者不能够构造或找到这样一个环R使得χ_r和H_r不含有素单环和（-）一环，其中K_r和H_r分别是包含R的最小特殊类和（R）的同态闭包。