"Once and only once" is the Extreme Programming phrase.
“一次且仅一次”是极限编程的座右铭。
It also makes sure dependencies are loaded once and only once.
它也确保依赖项已经加载一次，且仅加载一次。
Use QoS 2 when a message is to be delivered once and only once.
当消息仅传递一次时，使用QoS2。
Why do you think the essence of good design is once and only once?
似乎你曾经给出的唯一理由是好的设计可以提高开发速度。
A receive or pick activity must be executed once and only once if a process is to be executed normally.
如果流程要按照正常方式执行，则接收或选择活动必须执行一次，且仅执行一次。
Communication is also reliable because messages are guaranteed to be delivered once and only once when using JMS.
通信还是可靠的，因为使用JMS时系统保证消息被传送一次而且仅传送一次。
Reliable messaging refers to the ability of a sender to deliver a message once and only once to its intended receiver.
可靠的消息传递是指发送方向它所期望的接受方传递一次并且只传递一次消息的能力。
A second problem was handling sequential messages in an idempotent fashion, such that they are executed once and only once.
第二个问题是以幂等方式处理序列消息，这样这些消息被执行一次，且一次。
Bill Venners: in your book, Refactoring you say, "the code says everything once and only once, which is the essence of good design."
比尔：你在《重构》一书中提到：“代码应该实现任何逻辑一次且仅一次，这是良好设计的要素”。
In other words, the JMS provider can assure a message's sender that it was delivered to it's destination (a queue or topic) once and only once.
换句话说就是，JMS提供者可以向消息的发送方保证将消息发送到目的地(一个队列或主题)，并且是一次性发送。
The problem in Chow expect travel around, every city is accessed once and only once, we take into account the solution to the traveling salesman problem.
本题中周先生想到各地旅游，每个城市都被访问一次且仅一次，我们考虑到了旅行商问题的解决方法。
And remember, you only live once, but if you live it right once is enough.
记住，你的生命只有一次，但是生活态度正确一次就足够了。
Productivity — Solve problems and find answers faster, building intellectual capital from what we find once (and once only), and reusing more assets, templates and frameworks.
生产率——解决问题并快速找到答案，从我们曾经的发现构建智力资本，对更多的资产，模板以及框架进行重新利用。
Stateful command instances are generally used only once, or are pooled and recycled once the client is done with it.
有状态command实例通常仅仅使用一次，或者被放入池中，每次客户端使用完以后便回收。
Some yard equipment and home improvement tools get used only once or once in a while.
一些院子里的和改善住宅的工具往往只用一次或是一小段时间。
If you use a prompt button to submit your prompt selections, you can submit several prompt choices at once and only rerun the reports once.
如果您使用一个提示按钮来提交您的提示选择，那么您可以一次提交多个提示选择，但只重新运行这些报表一次。
Pages and page fragments are invalidated only once, rather than once per JVM.
页面和页面碎片仅作废一次，而不是每个J VM一次。
By setting the name once and then using the variable, you ensure that you don't get the filename wrong, and if you need to change the filename name, you only need to change the name once.
通过设置一次名称，然后使用相应的变量，可以确保不会用错文件名，如果需要更改文件名，也只需要更改一次即可。
Transport reliability has similar performance concerns but the interesting benefit is once-and-only-once delivery.
传输可靠性有类似的性能问题，但是其令人感兴趣的好处是一次且仅一次传送。
There is someplace that you once go and wouldnot like to leave and some one that you would only meet once in ur wholelife.
有一个地方，你去了就不想离开，有一种人，你一辈子只会遇见一次。
These applications write their data only once but they read it one or more times and require these reads to be satisfied at streaming speeds. HDFS supports write-once-read-many semantics on files.
这些应用都是写数据一次，读却是一次到多次，并且读的速度要满足流式读。
And, if a visitor searches for the same thing more than once during a single visit, the search will only be counted once.
而且，如果访问者搜索同样的事情不止一次地在一个单一的访问，搜索将只计算一次。
Setting the value to once is useful if a constraint is static once initialized, as it will then only be evaluated once and increase efficiency.
如果一个约束在初始化之后一直是静态的，那么可以将这个值设为once，这样可以使约束只计算一次，可以提高效率。
There are simply no mechanisms built in that allow HTTP requests to be reliably delivered using once-and-only-once or retry-until-success semantics.
这里没有使用一次且仅一次（once-and-only-once）或者重试直至成功（retry-until-success）的语义以允许可靠传输HTTP请求的机制。
Once again Nike faces the Adidas official-sponsor shutout approach, and once again Nike opts for a digital offense. Only this time, its marketers take a very different approach.
进入到2010年的世界杯比赛，再次面对阿迪的“官方唯一制定赞助商”身份，耐克再一次选择了运用数码手段进行反击，只不过这一次，耐克的营销人员采取了非常另类的做法。
Youth, give you, my life only once, prime not heavy, once a day morning, when encouraged in time, time and tide wait for no man.
青春，只赋予你、我一生一次，盛年不重来，一日难再晨，及时当勉励，岁月不待人。
There is someplace that you once go and would not like to leave and some one that you would only meet once in your whole life.
有一个地方，你去了就不想离开，有一种人，你一辈子只会遇见一次。
There is someplace that you once go and would not like to leave and some one that you would only meet once in your whole life.
有一个地方，你去了就不想离开，有一种人，你一辈子只会遇见一次。
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