to obtain
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to have to
have to, had to, must, to be obliged to, be obliged to
雨 太 大， 我们 不得不 取消 比赛。
The rain is too heavy, so we have to cancel the match.
他 昨天 不得不 加班。
He had to work overtime yesterday.
我 不得不 承认， 你 是 对 的。
I have to admit that you are right.