B1 except if除非;除了在…的情况下
More examples
A lot of shops won't accept cheques unless you have a banker's card with you.
They threatened to kill him unless he did as they asked.
Most wild animals won't attack unless they are provoked.
I can't let you in unless you give the password.
Students are not allowed to handle these chemicals unless they are under the supervision of a teacher.
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