good friend
definitions
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A person with whom one has a close, affectionate, and reliable relationship, characterized by mutual trust and support.ja: 親友
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A person who is helpful, beneficial, or advantageous to someone or an organization.ja: 有益な人
examples
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Is this my good friend you were telling me about?
あなたが話していた私の親友ですか?
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The donor has been a good friend to the hospital for years.
その寄付者は長年病院にとって有益な存在でした。