只有only if
除非发生什么特殊情况
only if some special situation arises
除非你来找,否则谁也找不到。
Unless you come and look for it, nobody will find it.
除非下命令,否则我们决不下火线。
We'll only leave the front line if we receive the order.
如果不是;除了unless; except
除非下雨,要不我一定去。
I'll certainly go, except if it rains.
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