public void Scale()
        {
            Database db  = HostApplicationServices.WorkingDatabase;
            DBText   txt = DBText(Point3d.Origin, "深居浅出", 100);

            txt.Annotative = AnnotativeStates.True;
            ObjectContextManager    cm  = db.ObjectContextManager;
            ObjectContextCollection occ = cm.GetContextCollection("ACDB_ANNOTATIONSCALES");

            foreach (ObjectContext oc in occ)
            {
                txt.AddContext(oc);
            }
            Circle cir = new Circle(new Point3d(265, 50, 0), Vector3d.ZAxis, 300);

            ToModelSpace(txt);
            ToModelSpace(cir);
        }