令Hm°vdz=Hdr=Hb Hab =alobar h ba ab=Jha的hdz=S ba Sa=」agdz=」中bdr=S bb ca haa t 2cacbhab +chubb Y E(ca, ch) ca +ch + 2cacbsab OE orY aZ aca z aca z ac ae 1 arY aZ 0 dcb z acb Z dcb      = = = = = = = = = = b b b * a b * a a a b b a * a b a b b a * a b a b b b * a b * a a a S d d S S d S H Hˆ d H H Hˆ d Hˆ d H             令       0 1 0 1 2 2 2 2 2 2 2 2 =   −   =   =   −   =   = + + + +  = b b b a a a a b a b a b a a a a b a b b b b a b c Z Z Y c Y c Z E c Z Z Y c Y c Z E Z Y c c c c S c H c c H c H E( c ,c )