韦氏学习者词典Clear and simple definitions in American English from Britannica's language experts. More usage examples than any other dictionary.·learnersdictionary.com·Jan 6, 2020韦氏学习者词典
牛津词典Explore Oxford Languages, the home of world-renowned language data.·en.oxforddictionaries.com·Jan 6, 2020牛津词典
