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It's nice to receive your mail/email (看是什么信了）.
As we are on a business trip at the moment,we are afraid that we can't reply to you quickly（如果你指的是现在写的这封信会得晚了,就应该是as we were on a business trip,we were not able to reply to you earlier).Sorry for that!
Arts Hotel Supplies Co.Ltd is our agent company in Macau.It's in charge of foreign trade of our company.