vt.催促,推进，驱策,力劝，规劝,极力主张 n.刺激，冲动,推动力 vi.催促,强烈要求，竭力主张
The fourth theory era divides tasks according to urgence and importance, into ABCD four grades.
第四代理论把事情按紧急和重要程序分为ABCD四类.