APPd

һ pd

̫ƽ܇W(wng) > ˹U(xin) > ˹U(xin)X(qin) > ˹2걣U(xin)X(qin)

˹2걣U(xin)X(qin)

2걣U(xin)X(qin)>>

˹

Ʒƣ

܇ͣ ˹

ٷr(ji) o(w)(bo)r(ji)

܇ģDƬ

ʾ

_

֮ܲ鿴܇ҵĺ܇тĻ؏(f)Ŷ

Ҫᆖ(wn) ᆖ(wn)