(3) 致歉:
I would be grateful if you would be so kind as to provide me with certain essential information regarding the following aspects.
I am writing to you because I am unable to.
I an terribly sorry that.
I would like to express my apologies for not being able to.
(4)询问:
I would like to obtain/request/seek/inquire about some information about
I am writing to ask if you can do me a favor.
I would like some detailed information on/about
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