only if

基本解释

Only if we let it.
如果我们让它这么做的话。
Only if they have learned to value the freedom free software gives them, to value freedom in and of itself rather than the technical and practical convenience of specific free software.
只有当他们认识到了自由软件给予用户自由的价值，承认自由和他们本身的价值，而不是某个自由软件技术上或实用性上的便利。
Whenever you hear the word If, then, and, or, not, If and only if, all these logical words, all, is, lovely logical words, you've got to be sensitized this week because I want to hear you.
不管什么时候你听到了如果，那么，和，或者，不，如果和只有当，这些逻辑词的时候，所有，是，很可爱的逻辑词，你这周要很敏感，因为我想听到你们。

It used to be that players in professional sports could change teams only if they were traded, sold or released.
It's as if the commodity of the bride is deemed truly valuable only if it can be guaranteed pure and untouched.
这就好像新娘这件商品,只有在完全的纯净没有动过才是有真正价值的。
耶鲁公开课 - 弥尔顿课程节选
The "parable of the vineyard" assures us that God rewards us regardless of our hard work and investment, but only if we're called, only if God chooses us.
葡萄园的寓言“使我们确信,无论我们是否努力工作都会得到上帝的奖励，但除非上帝选择了我们。
耶鲁公开课 - 弥尔顿课程节选

But only if it's accompanied by increased enforcement of immigration laws and tougher, broader enforcement.
FORBES: Magazine Article