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The next day is just that, the next day.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
スポーツ大会の翌日は、体中が痛くて大変でした。
The day after the sports tournament, my whole body was sore, and it was tough.
旅行から帰ってきた翌日は、何をしていたんですか？
What were you doing the day after you returned from your trip?
列車は翌日平常運転にもどりました。
The railroad service went back to normal the next day.
大雪の影響でイベントは翌日に延期されました。
Due to heavy snowfall, the event was postponed to the following day.
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