Eye of newt goes into the little black bag, if and only if there is reproducible scientific evidence that it works.

当且仅当有可重复的科学证据证明蝾螈之眼有效时，蝾螈之眼才会进入小黑袋中。

youdao

If they need to use others' words, they need to quote them and give the page number, even if it is only one word.

如果他们需要用到别人的话语，那么他们就需要引用并给出页码，即使所引用的只是一个单词。

youdao

Certain plant species won't flower if they sense too much light and some plants will only flower if they sense a specific amount of light.

某些植物种类如果感觉到了太多光就不开花，而有些只有感觉到了一定程度的光才会开花。

youdao

"I don't care," he said. "I am the only person who can tell you if your wine man has cheated you.

VOA: special.2009.02.07

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

As we all know, this only works if there is a pointee, which kind of gets back to rule number one.

众所周知，只有当有指针数据时，这个才起作用，这有点像第一条规则。

哈佛公开课 - 计算机科学课程节选

If they would only - if they were only here they would understand the X-Y-Z.

NPR: The Take on Obama in Illinois

And if only -- if only -- we should have done this outside.

WHITEHOUSE: Press Briefing

The stakes are too high to continue to hypothesis that if only teachers taught better and if only schools were more positive and less punitive, then education would be great or no student would be left behind.

FORBES: There Are No Silver-Bullets in Education Reform