unless
conj. /ənˈles/ B1
除非；如果不
Except if; only if not.
仙境例句
“No more tea for you unless you move one place on,” said the Hatter.
“除非你往下挪一个位子，不然就别想再喝茶。”帽匠说。
原著这一句
The executioner’s argument was, that you couldn’t cut off a head unless there was a body to cut it off from: that he had never had to do such a thing before, and he wasn’t going to begin at his time of life.
刽子手的理由是：没有身体就连脑袋都没法砍，他这辈子从没办过这种事，到了这把年纪也绝不破例。
卡罗尔原著 · 第 8 章