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英语口语中表明「收到」时所说的「Roger that」中「roger」是怎么来的,里面蕴含着什么典故吗? - 知乎 Wiktionary | roger [U]sed circa 1940 in UK and US military communication to represent "R" when spelling out a word "R" is the first letter in received, used to acknowledge understanding a message 解释一下—— 【惯例 1】1940 年左右,英国和美国军队通讯中,表明接收并了解了收到的一条信息,就说「收到」(received)的第一个字母「R