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。
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。
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。
Even if they don't, at least they will always know that they can live without computers, electricity, and smartphones—even if it is only for a few days!
即使他们不这样做，至少他们将永远知道，他们可以在没有电脑、电力和智能手机的情况下生活——即使只有几天！
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。
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）。
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 message will only reappear in the queue when the timeout period expires if, and only if, it has not been deleted by the reading process.
只有当超时周期过期时，而且读取消息的应用程序没有删除它，消息才会重新出现在队列中。
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。
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。
“All this will work if, and only if, the different countries are likely to do what they have to do in terms of restructuring the banking sector, ” he said.
“所有这些当且仅当不同的国家愿意做他们必须做的——重组银行业——才会起作用，”他说。
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。
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。
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。
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。
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。
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。
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, 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。
If, and only if, you use a third-party anti-virus program that is also anti-malware (the best ones are), you can also disable the Windows Defender service.
如果，仅仅如果你使用第三方反病毒程序同时也是反恶意软件程序(最好是这样)，你也可以禁用Windows保护服务。
If, and only if, the site reaches their goal of 1 million visitors will that "lucky blogger" receive any money.
只有网站访客数量达到一百万之后，“幸运的博客作者”才能拿到奖金。
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。
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。
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。
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。
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.
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。
For each case, print the operation result. The result should be rounded to 2 decimal places If and only if it is not an integer.
对于每一个测试用例，输出结果。（小数***）结果应四舍五入小数点后2位（当且仅当它不是一个整数------注意：如果结果不是小数就不要精确）。
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。
This refers to memory allocated on a pool, and will have to be copied internally if and only if the pool is destroyed within the lifetime of the bucket.
它引用在内存池上分配的内存，如果池在桶的生命周报内销毁时，经将必须在内部拷贝。
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。
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