f,ͨ~,f͡@ɂ~֮gƫY(ji)(gu),ʾǡf,ʾfĽY(ji),a(b)ǰ'f.,fǡfʹ֮.fķNx.
һxshu,Ҫ˼У
(1),f;
(2)V,vԒ;
(3)Փ(~,硰W(xu)fаf)ȵ.
xshu,˼DŽfeʹ Լ,硰f.
xyu,ͨ.
xtu,Óͨ.
͵ķNx÷ڬF(xin)hZʮҊ.F(xin)ڿ҂vġfеġf.@Ȼfġf˼^ӽ,@߉Ɣ,@ġf(yng)ԓxshu,ZԌW(xu)Еrһ߉?tЇˌW(xu)ZˌW(xu)ľ͛]ЬF(xin)@韩?F(xin)hZ~䡷
(ЇƌW(xu)ԺZо~侎Ҿ,̄(w)ӡ^,2002a(b))ėlĿСfĝhZƴעsǡshu f ǡshu f.