1864in Webster.
1964Endeavour Jan. 15/2 In English..‘TR’ is more frequent than ‘TU’, and Q is always followed by U. Such ‘di-gram’, and even some ‘tri-gram’, frequencies have frequently been counted.
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。