改正后的句子为the themes that Rita Dove explores in her poetry are universal,encompassing much of the human condition while occasionally dealing with racial issues.我对while…… 这个的主语不太清楚,我想的是while 后面如果省略主语的话,应该与原来句子的主语一致,那应该是themes,但是我觉得这里似乎deal的主语是Rita Dove。。。。求解,谢谢亲