片语

if and onlyif当且仅当

And Only If且仅当

IF-AND-ONLY-IF gate若且唯若闸

IF-AND-ONLY-IF element若且唯若组件

IF-AND-ONLY-IF operation若且唯若运算

in and only if当且仅当

iff if and only if有而且只有

英汉例句

• it is important to note that the service interface will be remotable if and only if it is derived from the bean「s remote business interface.

  注意，有一点很重要：当且仅当服务接口从bean的远程服务接口派生出来时，该服务接口才可以远程访问。

• at least 3 times in the body content (more or less depending on amount of content and if and only if it makes sense).

  在主体（body）内容中至少出现三次 (更多或更少的次数视乎内容的数量并当且仅当它是有意义的).

• 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。

• 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。

• 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。

• 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。

• according to soul theory, x is the same person as y if and only if x has the same soul as y.

  根据灵魂的理论，只有而且仅仅只有x与y有着完全相同的灵魂，才能认定x与y是同一个人。

• 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。

• 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）。

• this should happen if and only if another student can’t be found to address the issue.

  而只有当学生找不到另外一个学生来解决这个问题的时候，导师作用才会发挥出来。

• 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.

• 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。

• a positive integer is a prime if and only if it is exactly divisible by two integers, 1 and itself.

  一个正整数，如果能被并且只能被1和它本身整除，那么这个数就是一个素数。

• 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。

• 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。

• now, if you tell the compiler to try to compile this, it will succeed if and only if x11/x.h> is in the compiler「s include path.

  现在，如果您用编译器来尝试进行编译，那么只有当 x11/x.h>在编译器的include路径中时，编译才会成功。

• 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）。

• 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。

• 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。

• but notice thata doubling of u would lead to the same choices, because u(x1, y1)> u(x2, y2) if and only if 2u(x1,y1) > 2u(x2, y2).

  我们注意到两份的u也会导致同样的选择，因为u（x1，y1）>（x2，y2），能且只能推导出2u（x1，y1）>2u（x2，y2）。

• x is the same person as y if and only if x has the same soul as y.

  若两个人有着相同的心灵，那么就必定是同一类人。

• 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。

• if he holds out, the sales manager might give him a chance to buy the car for $20, 000, if and only if he agrees to have the car dealership arrange financing.

  要是他坚持，那么销售人员也许真的会给他一个机会只花2万美金，但前提是同意由经销商提供汽车贷款。

• it is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.

  具有对称性：对于任何非空的参考值x和y，当且仅当y.equals(x)返回真值是，x.equals(y)也应该返回真值。

• 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。