(dng)ǰλã߿W(xu)W(wng) > W(xu) >
̖(ho)
ǭ|όƌW(xu)У
1
FϢI(y)g(sh)W(xu)Ժ
2
ǭ|I(y)g(sh)W(xu)Ժ
ȫ(gu)УЩ
ЩƴW(xu)Ќ
ЩW(xu)
߿kW(xu)Ժ
߿־ԸI(y)xָ