been acquainted with
definitions
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to have known or met someone or something beforeja: 以前に誰かまたは何かを知っている
examples
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I have been acquainted with this software for years.
私はこのソフトウェアを何年も知っています。
I have been acquainted with this software for years.
私はこのソフトウェアを何年も知っています。