Programmatic proxy creation is useful when writing infrastructure code and tests, but is not often used in regular business applications.

编程式的代理创建在编写基础结构代码和测试时比较有用，但在通常的业务应用中并不经常使用。

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The existence of new revenue streams for some but not all councils is complicated, and businesses are often opposed, fearing higher costs will make them uncompetitive.

对于部分但非全部的地方议会来说，新的收入来源的存在是复杂的，并且经常遭受企业反对，因为他们担心更高的成本会使他们失去竞争力。

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Endogenous rivers often do not reach the sea but drain into inland basins, where the water evaporates or is lost in the ground.

内源河流通常不会流入大海，而是流入内陆盆地；在那里，水会蒸发或流失到地下。

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But the real life of the cowboy is not often shown.

VOA: special.2010.03.25

But to do that is I recognize not without dangers often severe dangers of its own.

但一旦这么做，我要坦言，不是没有风险,通常还会是来自其本身的巨大风险。

耶鲁公开课 - 政治哲学导论课程节选

Often, for a particular state change, it is easy to calculate two of these, but not the third.

对于一些特定的状态变化，它们中的两个很好计算，但是第三个往往不容易计算。

麻省理工公开课 - 热力学与动力学课程节选

Chest pain is the most common reason people visit the ER, but it is often not related to a problem with the heart.

FORBES: Coronary CT Scans May Save You (And Your Hospital)

"I don't often use that word but then it is not very often that you get to meet one, " he said.

BBC: Last 1953 Everest team member George Lowe dies, aged 89

But marriage is about children, say some: to which the answer is, it often is, but not always, and permitting gay marriage would not alter that.

ECONOMIST: It rests on equality, liberty and even society