那意味着至少理论上他比他们级别高。That meant that he, notionally at least, outranked them all.从理论上说，我现在昼夜待命。In theory I'm on call day and night.这项研究从理论上说明了梦在人们生活中的作用。The study theorizes about the role of dreams in peoples' live...

“理论上”的英语可以翻译为：in theory，theoretically，in the abstract ...