“粗略地”用英语怎么说

他跟我们非常粗略地讲了他参观的情况。He gave us a very sketchy account of his visit.这个问题在序言中已粗略地提到了.The subject has been referred to cursorily in the preface.他粗略地概述了歌剧的情节.He roughly outlined the plot of the opera....