1830Cobbett Hist. Geo. IV, iii. §139 He did it unofficially, in letters to Lord Grey.
1860Froude Hist. Eng. VI. 275 The two Houses of Parliament were invited to be present unofficially at Whitehall.
英语词典包含277258条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。