Ϻxh(hun)Ƽ˾a(chn)ĺx۱ϩڲͬpHֵlîa(chn)Ʒķ@IJPHֵ^(qing)γɽ(lin)ΠγxӾ۱ϩ͵ͷ;SPHֵᷴ(yng)ҺAԵu,ʹ(yng)xӾ۱ϩup,ܽԺ@NF(xin)ԚwpHֵlP(gun)ķӃ(ni)ͷӾۺc(yng),γһ(g)朗l(lin)ͮa(chn)Ʒ,Ԍ(do)®a(chn)ƷܽܲѺͷۺС;ڸpHֵ,Ԅ(chung)һN(sh)ϩ(NTP),NTPǷ(yng)Нڵ߀ԭ,ķ(yng),ͬr(sh)ҲNTPD(zhun)Ƅ,(hu)(do)Ka(chn)ƷĽ,ʹܽԺ
xh(hun)xӾ۱ϩSضȵ׃څ(sh),ӳ˷(yng)ضȌ(du)ϳɮa(chn)ƷӰҎ(gu)ɡS(yng)ضȵ,a(chn)ƷķȻu½ԭ,ɻa(chn)ڵ͜ء(sh),T(do)L(zhng)ھ,Bi(yng)L(zhng),Ķɵõ߷xӾ۱ϩa(chn)Ʒ;S(yng)ضȵ,ķ(yng)ļM(jn),푑(yng)ٶ,AڽKֹBi(yng),ɮa(chn)Ʒͷ(yng)Ĝض̫,Ҳ(yng)̫,ʹ(yng)r(sh)g̫L(zhng),ӰЧʵķ(yng)(yng)ض^ߵԒ,ϵy(tng)(ni)ɻ(yng)ԽԽ,ըһ,ʹ˴˷g(lin),ɞһ(g)zIJɴ˿Ҋ,m(dng)?sh)ķ?yng)ضǫ@Įa(chn)ƷҪC,(sh)(yn)Ҍm(dng)?sh)ķ?yng)ضȵĜضȿ20 - 30淶