箱の中身

contents of the box

→ 箱
phrase Rare #31,542
contents of the box Literally means “the inside contents of the box.” 箱 means “box,” and 中身 means “contents” or “what is inside.”
JA: 箱の中身を確認してください。
EN: Please check the contents of the box.

彼は箱の中身をあけた

He opened the box and took out its contents.

箱の中身を見せてください

Please show me what's inside the box.

箱の中身って、知ってる

Do you know what's inside the box?

箱の中身出しなさい

Take everything out of the box.

— ラ・ラ・ランド (2016)

箱の中身知ってるよ

I know what's inside the box.

箱の中身は何

What's inside the box?