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。
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。
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。
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。
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。
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。
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。
For example: an existential sentence is true on some finite field if and only if it is true on some field.
例如：一个存在语句能在一有限域上成立当且只当它能在一域上成立。
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）。
It is proved that a simple graph G is automorphism line graph if and only if the graph G is 2-regular graph.
首次给出自构线图的定义，并证明：简单图G为自构线图的充要条件是图G为2-正则简单图。
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。
The Boolean operation whose result has the Boolean value 0 if and only if each operand has the Boolean value 0.
一种布尔运算，当且仅当每个操作数都具有布尔值0时，其结果才具有布尔值0。
The compact theorem is proved, which states that theory T has model if and only if any finite subset of T has model.
利用中介逻辑的完备性，本文证明了紧致性定理，即一理论有模型当且仅当其任一有穷子集有模型。
A rational decisionmaker takes an action if and only if the marginal benefit of the action exceeds the marginal cost.
一个理性的决策者只有当一个行动的边际利润大于边际成本时，才会采取这项行动。
The results are three if and only if conditions under which an optimal schedule is of interval perturbation robustness.
本文的结果是该问题在加工时间扰动下最优调度具有区间摄动鲁棒性的三个充分必要条件。
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。
First, we show that an online reverse auction is incentive compatible if and only if the auction is based on a demand curve.
首先，证明了基于采购商需求曲线的在线反向拍卖是激励相容在线反向拍卖的充分必要条件。
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。
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）。
Theorem 3 X is a bornologic space if and only if every uniformly bounded set of linear operators from X to Y is equicontinuous.
定理3X是囿空间的充要条件为：每个从X到Y的一致有界的线性算子族都是等度连续的。
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。
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。
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。
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