致函(某機構)(索取資料等)
write off / away (to sb / sth) (for sth)
to write to an organization or a company, usually in order to ask them to send you sth
I've written off for the catalogue.我已去函索取商品目錄。
釋義來自《牛津高階英漢雙解詞典》第 9 版