F(xin)ڵλã(y) > a(chn)܇g > Ԕ(x)(ni)
һ(y): ^
һ(y): a(chn)܇g
I(yng)a(chn)ƷУÓˮ؇UҺwUˮٟtpw併؇C(j)ÓSƷr(ji)(bo)r(ji)