letter of introduction
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病院に行く前に紹介状を書いてもらった。
I had a referral letter written before going to the hospital.
大学の先生に紹介状をお願いした。
I asked my university professor for a letter of introduction.
紹介状があると診察がスムーズです。
If you have a referral letter, the examination goes more smoothly.