六级词汇正序版-75

练习内容

[{"word":"optimistic","pronun":"[ˌɑːptɪˈmɪstɪk]","translation":"adj. 乐观的；乐观主义的","audio":"optimistic.mp3"},{"word":"optimum","pronun":"[ˈɑːptɪməm]","translation":"adj. 最适宜的\nn. 最佳效果；最适宜条件","audio":"opt