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have to
01
必须
used to indicate an obligation or to emphasize the necessity of something happening
02
必须
to be certain about something happening or being true in a given situation
例子
I have to finish this report by the end of the day.
He has to pick up his kids from school at 3 PM.
They have to study hard for their exams next week.
We have to be at the airport two hours before the flight.
We have to pay our bills before the due date to avoid late fees.
