in theory简单

In theory

理论上

In theory, the [success] of an applicant should not depend on the few others [chosen] randomly for interview during the same day, but Dr. Simonsohn suspected the truth was [otherwise].

理论上，一名申请者能否成功不应取决于同一天被随机选中参加面试的其他几个人，但西蒙松博士怀疑事实并非如此。

In the internet age, at least in theory, this fraction can be much reduced.

在互联网时代，至少从理论上讲，这一比例可以大大降低。