對...作進一步說明

used in letters, emails, etc. to refer to a previous letter, email, conversation, etc.

e.g.1 Further to our conversation of last Friday, I would like to book the conference centre for 26 June

E.g. 2 Further to our letter of February 5th, we can now confirm that all the spare parts you requested are available.      

为了对我们二月五号那封信作进一步的说明，我们现在可以保证你们所要的零件都有现货。