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。
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。
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。
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。
To see this yourself, design a small test program that will compile if and only if the desired condition is true.
为了能切身体会，您可以设计一个小测试程序，这个程序当且仅当期望的条件得到满足时才可以编译。
Eye of newt goes into the little black bag, if and only if there isreproducible scientific evidence that it works.
把蝾螈眼放入黑色的小袋子，当且仅当有重复性的科学证据表明它的实用性）。
Let me remind you again that an argument is valid if and only if the premises are true the conclusion must be true.
我再来提醒一下，论点有效，如果且仅如果前提为真，结论肯定为真。
That is, society will reward you with a remarkable life if and only if you can offer in return a useful and rare service.
社会奖励你的非凡生活仅是作为对你向社会提供珍稀服务的回报。
The previous exercise shows that individual residents gain from their marginal contribution if and only if the park is smaller than.
以上练习表明当且仅当公园面积时，居民捐款的边际收益是为正。
Make sure an HTTP 200 response is sent back if and only if the response was successful and the returned data is the expected one.
只有在请求确实成功了而且返回的数据就是期望的数据的情况下，才应该发送回http响应码200，必须确保这一点。
The Bondareva-Shapley theorem:The core of the game is non-empty if and only if the game is balanced (Bondareva 1963, Shapley 1967).
Bondareva-Shapley定理：只有而且仅有当博弈是平衡的时候，中心才非空。
And the reason for that because an argument is valid if and only if there are no possible situation in which all its premises are true and its conclusion false.
原因是因为论点有效，如果且仅如果没有可能情况，所有的前提都为真结论为假。
If a project has a unique IRR, we can state that the project increases the value of the company if and only if the project's IRR exceeds the annual cost of capital.
如果一个项目有唯一的IRR我们指出项目增加公司价值当且仅当项目的IRR超过年资金成本。
That is, a channel guard is ready if and only if the process at the other end of the channel has output to it and this data has not yet been input by this process.
也就是说，只有在通道另一端的进程已经输出数据，而该数据还没有被进程输入的时候，警卫才就绪。
For instance, a good test assertion is a JUnit test that returns true if and only if the SOAP envelope returned by a Web service is identical to a pre-defined XML document.
例如，一个较好的测试断言为JUnit测试，即当且仅当Web服务返回的SOAP信封与预定义的XML文档完全相同时，返回true。
Okay I gave you another test. That was one test of validity and another test I gave you was in the argument is valid if and only is it's counterexample set is inconsistent.
好，给你们另一个测试，这是有效性的测试，另一个是有效论点中，如果且仅如果这是不一致的反例。
The filter evaluates to true if and only if number of total occurrences (including the current one) is a multiple of 3. Figure 21 shows what the completed filter will look like.
当且仅当事件的总发生次数(包括当前发生的事件)为3的倍数时，该筛选器才求值为True。
If headaches only occur at night, lack of fresh air and oxygen is often the cause.
如果头痛只发生在晚上，缺少新鲜空气和氧气常常是其原因。
It will only disappoint him if I get worse again—and I may get worse this very night.
如果我的身体再次变差，只会让他失望——而且我的病情可能今晚就会会恶化。
He refused to develop projection technology, reasoning that if he made and sold projectors, then exhibitors would purchase only one machine—a projector—from him instead of several.
他拒绝研发投影技术，理由是：如果他研发并且销售放映机，电影放映者们就只会从他那里买一台机器，而不是几台。
The first draft will appear on the page only if you stop avoiding the inevitable and sit, stand up, or lie down to write.
只有当你不再回避不可避免的事情，而是坐着、站着或躺着写作时，初稿才能跃然纸上。
But this only works if the site hasn't been touched, and the layers are intact.
但这只对那些完全没有被盗掘过的坑位才有效，因为这些坑位的地层都完好无损。
Hence, depictions of violence among teenagers should be prohibited from movies and television programs, if only in those programs and movies promoted to young audiences.
因此，只要是那些向年轻观众宣传的节目和电影，就应该禁止其描写青少年暴力。
If you're still skeptical about exercising, we can only ask you to trust us and give it a try.
如果你仍对锻炼持怀疑态度，我们只能请你相信我们，试一试。
Children universally prefer to live in peace and security, even if that means living with only one parent.
孩子们普遍愿意过平静安宁的生活，即使那意味着只能和单亲生活在一起。
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。
I say you only live once and we work hard and what's the point if you can't go on holiday.
我觉得你就只活一次，我们努力工作，如果不能去度假的话生活又有什么意义呢？
Note that cheques take longer to clear in France than in Britain, and can only be stopped if stolen or lost.
请注意，支票在法国清算的时间比在英国要长，而且只有在被盗或丢失时才能被停用。
Dummling answered: "I have only cinder-cake and sour beer; if that pleases you, we will sit down and eat."
小傻瓜回答说：“我只有炉灰烤饼和酸啤酒；如果你愿意的话，我们可以坐下来吃。”
Only if non-OPEC nations, including Norway, Mexico, and Russia, were to trim output by a total of 500,000 barrels a day.
除非挪威、墨西哥和俄罗斯等非欧佩克国家将日产量总计削减50万桶。
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