letter-perfect
adjective US uk/ˌlet.əˈpɜː.fɪkt/ us/ˌlet̬.ɚˈpɝː.fɪkt / (UK word-perfect)
一字不差的；能一字不差地背出的；滚瓜烂熟的
used to describe words produced without any mistakes, or a person who is able to repeat a particular text from memory without making any mistakes
His mother rehearsed his lines with him and by the time the play opened he was letter-perfect. 他妈妈跟他对台词，到演出开始时他已经背得滚瓜烂熟了。
"Your German was letter-perfect," Franz said. “你的德语讲得一字不错。”弗朗兹说道。
a letter-perfect rendition/recitation 娴熟的表演／一字不差的背诵