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If only和only if怎么翻译,有啥区别?

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If only和only if怎么翻译,有啥区别?
If only和only if怎么翻译,有啥区别?
if only.要是.多好!
If only I had known you then," he said wistfully.“要是我那时候认识你就好了,”他伤感地说
only if...只要…就;只有,只有当…;除非
You can make progress only if you are modest.惟虚心乃能进步.