商业: commerce; trade; business 短语和例子商业不景气 commercial depression; 商业支票 commercial paper; 与 ... 进行商业贸易 carry on commerce with ...; 轻视商业 despise trade; 他从事商业。 he is engaged in commerce. 商业已变得肃条。 c
集中学习: ma ed learningmassed learningundistributed repetition
