/ənˈles ||; ənˈlɛs/conj if... not; except if 如果不；除非:
I was told that unless my work improved, I would lose the job. 我被告知，除非我工作表现有改善，否则将会被解雇。‘Would you like a cup of coffee?’ ‘Not unless you've already made some.’ “你要喝杯咖啡吗？”“不了，除非你已经煮了一些。”Unless anyone has anything else to say, the meeting is closed. 如果大家没有其他意见发表，会议到此结束。Don't switch that on unless I'm here. 除非我在这里，否则不要开这个开关。