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One universal event can only happen once. It's too rare to happen more than that.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Just watch out because へん becomes ぺん here.
一遍だけでいいから、キャビアを食べてみたかったの。
I wanted to try caviar, even if it was only once.
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