主题：请老师帮我把这个文华策略改成金字塔策略。谢谢！

A1:=REF(H,1);
A2:=REF(L,1);

if TIME<151300 and H<REF(H,1) and C<REF(C,1) and (timetot0(dynainfo(207))>=time0-1  or not(islastbar)) then buyshort(holding=0,1,market);
if TIME<151300 and L>REF(L,1) and C>REF(C,1) and (timetot0(dynainfo(207))>=time0-1  or not(islastbar)) then buy(holding=0,1,market);

if ref(L<REF(A2,enterbars),1) then sell(1,0,market);
if ref(H>REF(A1,enterbars),1) then sellshort(1,0,market);
if ref(C<HHV(H,enterbars+1)-20,1) then sell(1,0,market);
if ref(C>LLV(L,enterbars+1)+20,1) then sellshort(1,0,market);

if time>=151300 then begin
 sell(1,0,market);
 sellshort(1,0,market);
end