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1·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。

2·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。

3·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。

4·A good deductive argument is sound if and only if it's both valid and has true premises.

一个好的演绎论点是完好的，如果且仅如果这些都有效，并且前提为真。

5·An epistemic proposition is true if and only if it is a member of corresponding world.

一个认知命题是真的，当且仅当它属于相应的认知世界之中。

6·China a would recognize the US's claim if and only if the US is returned to its natives.

中国将承认美国的申索当且仅当返回美国原住民时。

7·Returns: true if and only if the name should be included in the file list; false otherwise.

测试指定文件是否被包含与指定的列表里面，如果是则返回真，如果否，则返回假。

8·Two rank-finite matrices are same-inverse equivalent if and only if their rank equal is proved.

证明了除环上秩有限的二无限方阵同逆等价的充要条件是它们的秩相等。

9·Playing games is such a good method to have fun, if and only if you can handle the game in healthy way.

游戏是获得快乐的一种很好的途径，但如果与这渐行渐远获得的会是伤痛。

10·The fact is that your potential is unlimited if and only if you believe and you act towards drawing on it.

事实上，只要你相信并且如此去做，你的潜能就会是无限的。