disquisition

n ~ (on sth) long elaborate spoken or written report or account （悉心作出的）长篇演讲或论文.

disposed, disposition, dispossess, dispossession, disproof, disproportion, disproportionate, disprove, disputable, disputably, disputant, disputation, disputatious, disputatiously, dispute, disputed, disqualification, disqualify, disquiet, disquieting, disregard, disrepair, disreputable, disreputably, disrepute, disrespect, disrespectful, disrespectfully, disrobe, disrupt, disruption, disruptive, dissatisfaction, dissatisfied, dissatisfy, dissect, dissected, dissection, dissemblance, dissemble,