1. The doorbell rang and Peggy ran fleetly to answer it, calling that it must be Santa Claus. ��ʱ�������ˣ��弪һ�߷ɱ���ȥ���ţ�һ�߽���һ����ʥ�����ˡ�
2. Modeling language is used broadly nearly in all of fields in these years, it is an assurance of developing a system fleetly. ��������ģ���Եõ��㷺Ӧ�ã��ѳ�Ϊϵͳ���ٿ�������Ч���ߡ�
3. Using the method can quicken the speed of building solid model bank and has actual significance to build complicated scene fleetly. ���ô˷����ɼӿ���άģ�Ϳ�Ľ��������ڸ��ӳ����Ŀ��ٴ��ʵ�����塣
