business history split off from economic history in the u.s.a. in 1920s . 在20年代美国又将企业史从经济史中分化出来。
herding : this group split off from the working group in 1983 [牧放组:这一组在1983年从工作组分化而来。
the satellite split off from the rocket about 25 minutes after its 00 : 20 entering a geosynchronous transfer orbit “鑫诺二号”卫星于29日零时20分点火升空,25分钟后与运载火箭分离,进入地球同步转移轨道。