In reply to your recent letter regarding the supply of 10 free sample units of our product No.1080, we regretfully have to say that we are unable to supply them.
问题:请翻译下中文意思,要突出 “In reply to”的意思。与“In reply to”类似的用法还有那些短语词组?
参考资料:Longman dictionary 朗文字典