don't judge a book by its cover (dont juj a buk bai its kover)

Idiom Proverb

意味

you shouldn't form an opinion on someone or something based purely on what you see on the outside

見た目だけで誰かや何かを判断すべきではない

例文

"She may look serious, but don't judge a book by its cover."

"彼女は真剣に見えるかもしれませんが、見た目で判断してはいけません。"