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customer : 물건을 사는 손님 ex) Samsung has a lot of customers. client : 무형의 물건 ex) That lawyer has planty of clients.
Pick up the phone.
with 입니다. This is Mickael with OO Inc.
영어 전화번호 앞에는 at이 붙습니다. ex) Please call me at 010-2222-2222 ex) Please have her call me on my cell phone at 010-2222-2222