acronym for North American Free Trade Agreement, negotiated from 1991, signed Dec. 17, 1992, implemented 1994.
updated on April 18, 2010
英语词源词典收录了45867条英语词源词条，基本涵盖了全部常用英语词汇的起源、历史，是研究英语词汇或通过词源学英语的必备工具。