un
less
1
除非, 如果不
used to say that something depends on something else to happen or be true
- You won't pass the exam unless you study hard.
- They won't arrive on time unless they leave right now.
- The deal won't go through unless both parties agree to the terms.
- She can't get the job unless she meets all the qualifications.
- We won't be able to start the meeting unless everyone is present.