I heard she was twenty,but she must be least thirty years old.哪错了

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I heard she was twenty,but she must be least thirty years old.哪错了
I heard she was twenty,but she must be least thirty years old.哪错了

I heard she was twenty,but she must be least thirty years old.哪错了
at least
adv.
至少
According to the lowest possible assessment; not less than:
至少:根据最低可能的判断;不少于:
waited at least an hour.
至少等了一小时
I heard she was twenty,but she must be at least thirty years old

but she must be (at)least thirty years old.

I heard she was twenty, but she must be at (the) least thirty years old .

I heard she was twenty, but she may be least thirty years old