<正>July21,1986wasanunusualdayforMexico,abigcountryinLatinAmerica.Afterpainfulchoiceandcautiousinvestigation,afterall-roundendeavorandstruggle,MexicoeventuallybecameamemberofGATT.Fromthenon,itenjoyedMost-Favored-Nationtreatmentsuchaslowertariffratesbetweenthemembers,andthefavorable-treatment