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頑張らないと

have to work hard

→ 頑張る
phrase Rare #34,516
have to work hard Often used as an abbreviated form of 頑張らないといけない, meaning “have to work hard.”
JA: 明日の試験のために、もっと頑張らないと。
EN: I have to work harder for tomorrow’s exam.

まだまだ頑張らないとダメだけどね

I still have a long way to go, though.

— 甘い生活 (1960)

彼はもっと頑張らないと何も成し遂げられないだろう。

He won’t accomplish anything unless he works harder.

次はもう少し頑張らないとダメだぞ。

You’ll have to try a little harder next time.