natural
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毎日練習すれば上手になるのは当たり前です。
If you practice every day, it is natural that you will improve
親に感謝するのは当たり前だと思います。
I think it is natural to be grateful to your parents
そんなことは当たり前すぎて気づきませんでした。
It was so obvious that I did not notice it