con‧cern‧ing W3 / kənsɜnɪŋ $ -ɜr- / 介词

about or relating to :

calls from young children concerning lost pets

the facts concerning Marr’s car crash

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In everyday English, people usually say about rather than concerning :

I’ve already written to him about the problem.

THESAURUS

about used when saying what the subject of something is : She’s always talking about you. | In her novels she writes about life in South Africa. | There’s something I wanted to ask you about.

on about a particular subject : a book on English grammar | a report on poverty in rural areas

concerning/regarding formal about : Prince Saiid answered questions concerning Kuwait’s future. | The report raises a number of questions regarding food safety.

with regard to formal about – used especially when you want to start talking or writing about something : Dear Sir, I’m writing with regard to your advertisement in The Times.

re used in business letters and in emails to introduce the subject that you are going to write about : Re: Friday’s meeting