“一次且仅一次”是极限编程的座右铭。
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。
Transport reliability has similar performance concerns but the interesting benefit is once-and-only-once delivery.
因为纸上文字的褪色时间可以延长，并且纸张可以被循环利用上百次且质量稳定。
The writing can last longer, and the paper can be reused hundreds of times without loss of quality.
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”。
Bill Venners: in your book, Refactoring you say, "the code says everything once and only once, which is the essence of good design."
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。
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.
TSP问题描述的是一个旅行商要到几个城市去，每个城市必须去一次且仅能去一次，要求满足这样条件的最短路径。
TSP is a description of the TSP to several cities, each city must go only to one that once such conditions are met the shortest path.
更通用一点的定义是：一个瞬间就是指时间线上只出现一次且唯一的一个时间点，并且这种日期结构只能以一种有意义的方式出现一次。
To define it generically: an instant is a point on the time line that is unique and occurs only once, and such a date construct can occur only once in a meaningful way.
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。
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.
沿着旧丝绸之路旅行是一次有趣且收益颇多的经历。
Traveling along the old Silk Road is an interesting and rewarding experience.
当一个年轻的雇员在一次车祸后截瘫且精神不振的时候，艾拉给了她一份办公室工作，并拒绝让她退学。
When a young employee was left paraplegic and depressed after a car accident, Ella gave an office job and refused to let her drop out of college.
胡萝卜在两次世界大战期间最受青睐，当时的粮食短缺迫使人们食用胡萝卜，且政府公开宣传胡萝卜有多么健康。
Carrots got their biggest boost during the two world wars, when food shortages forced people to eat them, and governments told everyone how healthy carrots were.
组织中的行为并不是由一种详细的蓝图和日程表预先且一次性地决定好的。
Behavior in the organization is not determined in advance and once and for all by a detailed blueprint and schedule.
所以他们其余的时间只能在街上见面，每晚在一个不同的地点见面，且一次绝无可能超过半小时。
For the rest they could meet only in the streets, in a different place every evening and never for more than half an hour at a time.
起因：代码的某些部分在每次方法调用中下行了两级且第二次下行时调度不当。
Cause: Some part of the code is descending two levels per method call without dispatching appropriately on the second descent.
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。
A receive or pick activity must be executed once and only once if a process is to be executed normally.
且像之前的每一次平台预览一样，开发者指南包括了所有可用功能特性的一个清单。
And as with each previous Platform Preview, the Developer Guide includes a list of all available features.
只有被一个你认识且信任的人呵痒才会是一次无害冒犯。
Only tickling by someone you know and trust can be a benign violation.
作为一个规定，在烹炸用油丢弃前只重复使用一次，且在第一次使用后的几周内重复使用。
As a rule, reuse it one time before disposal, and reuse it within a few weeks after the first use.
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。
A second problem was handling sequential messages in an idempotent fashion, such that they are executed once and only once.
它也确保依赖项已经加载一次，且仅加载一次。
It also makes sure dependencies are loaded once and only once.
它们一次只能用于一个文档，且返回文档片断(可能为空)。
They only apply to one document at a time and may return a (possibly empty) fragment of a document.
但是，最关键的是，梅德韦杰夫及其支持者都没有表态，他们期望在一次公平且自由的选举中竞争。
Most significant, however, is the fact that neither Dmitry Medvedev nor his supporters have said that they expect or want to compete in a free and fair election.
审讯报告指出警察最后一次在埃德温丝遇害且被发现的广场巡逻的时间距她死亡的时间仅有14分钟。
The inquest report shows only 14 minutes elapsed from the time the police did their last sweep of the square in which she was killed and her body being discovered.
德克萨斯州常将自己看成是加州更机智的对手，且又一次夺冠。
Texas, which likes to see itself as California's nimbler rival, again topped the list.
如示例所示，实时任务接收到单一处理器的最大份额且只能调用61次。
As shown, the real-time task receives the lion's share of the single processor and is invoked only 61 times.
但是如果邀请穿着新颖的花童的话会是一笔不小的开销，事实上你一生只穿一次，有且只有一次对吧？
But the dress New Style Flower Girl Dresses is worth while to invest in, to pay a lot if we take into consideration the fact that you wear it once in life time, only one night?
你最后一次见到一个狼狈且一无是处的家伙出现在酒吧里或者派对上，是什么时候的事了？你的回答——什么？
When's the last time you saw a guy walk into a bar or party looking useless and confused?
三次当选的州长将该州管理得愈加繁荣，且保守立场相当坚定。
A thrice-elected governor from a big state which has boomed under his management, with pretty solid conservative credentials to boot?
三次当选的州长将该州管理得愈加繁荣，且保守立场相当坚定。
A thrice-elected governor from a big state which has boomed under his management, with pretty solid conservative credentials to boot?
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