HSK 4
不得不
bùdébù副
have no choice or option but to; cannot but; have to; can't help it
车坏了我们不得不走路回家。
Chē huài le wǒ men bù dé bù zǒu lù huí jiā.
The car broke down, so we had to walk home.
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New in the HSK 3.0 word list at level 4.