答复来信to reply by letter
及时复信
write a timely response
回信letter in reply
信寄出很久了，还没有收到复信。
There's been no reply even though the letter was sent ages ago.
汉译英翻译词典收录86165条汉英翻译词条，基本涵盖了全部常用中文字词的英语拼写、翻译、音标、读音、用法、例句等，是英语学习的有利工具。