除非 英语怎么说

"除非" 的英语表达是 "unless"。这个词来源于中世纪拉丁语 "unles"，意思是 "except if"。例句如下：
Unless you want to be late, you should leave now. (除非你想迟到，你应该现在就走。)
You can't come in unless you have a ticket. (除非你有票，否则你不能进来。)
She won't be happy unless you apologize. (除非你道歉，她不会开心的。)