// formular for the develop of an area
industry
skill=(zhimou+meili)/2
level=i_national_level*30+i_local_level*70
// 称帝前
i_national_level=(king+p_q_js+sum(P_Q_FJS)/3+sum(P_Q_ZP)/(num(P_P_ZP)+3))/3
// 称帝后
i_national_level=
(king+R_CX+R_ZX+R_SM+R_ST+R_SK+R_GBSS+R_GBSL+SUM(R_DXS+R_XS)/NUM(R_DXS+R_XS))/9
i_local_level=(RL5_TS+RL5_JS+sum(RL5_FJS)/2+sum(RL5_GYG)+
sum(RL5_SY)/10+sum(RL5_WEG)/(num(RL5_WEG)+10))/7
importance : if importance level+6
if no importance level + 2
if has importance but this is not importance level=level
L1=cur level
L2=exp level
LX=next level
L=L2-L1
if L<=0
L=0
X=random(L+3)-3;
if X>3 X=3
LX=L1+X
agriculture
and bussiness 
are similar to industry
