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

This is true as the above derivation for a and b of opposite parity is an if and only if statement.

这是正确的，因为上面对 a 和 b 的奇偶性的推导是一个当且仅当命题。

youdao

Please note: This file is generated if and only if the project is built.

请注意：该文件当且仅当项目构建时生成。

youdao

If you start a path of one color you must continue to use only toe and handholds marked with that color.

VOA: special.2009.12.09

If you're pure, not only are meats and viands pure , but all kinds of knowledge, whether of good and evil.

如果你纯洁，不只是肉和食物，肉和酒会变得纯洁，所有的只是，无论善恶都会变得纯洁。

耶鲁公开课 - 弥尔顿课程节选

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

From an evolutionary viewpoint, a function can be assigned to a DNA sequence if and only if it is possible to destroy it.

FORBES: ENCODE Papers Get A Fisking

My belief is that the brand will retain its star status if and only if the ride is worth cheering about and the value is there.

FORBES: Boo? Hiss? When The Shouting Stops, Only Experience Will Determine Whether Netflix Remains A Star Brand

As a result, I presented a plan that committed me to hitting a clear and unambiguous revenue target if and only if engineering would commit to making the upgrades on time.

FORBES: How to Write a Plan or Proposal That Rocks