Files are a common source of operational data that businesses need to integrate into their data warehouses.

文件是常见的运营数据来源，业务需要将这些数据整合到数据仓库中。

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A common source of such rogue changes are attempts to debug an issue in production.

这样的秘密更改的一个常见来源是企图调试生产中的问题。

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Database access and responsiveness problems are a common source of problems for J2EE applications.

对于J2EE应用程序来说，数据库访问和响应性是一个常见的问题来源。

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So in other words, if you terminate these lines early, if you terminate the four loop early, if you terminate an if condition early with that semicolon, the code may very well work; and this is a common source -- of frustration and conundrum because you don't -- because your code looks right and yet it's misbehaving, but that semicolon means stop looking for subsequent lines of related code.

换句话说，如果你用分号过早的终止了这些代码行，如果你过早地终止了那个for循环，如果如此,一个if条件，代码可能可以运行，这就是,挫折和问题产生的源头，因为你没有-,因为你的代码看起来是正确的，但是运行是错误的，那个分号的意思是,停止寻找后面相关的代码。

哈佛公开课 - 计算机科学课程节选

"As much as it's an effective, common-sense source of some sustainable electricity, it's also a great way for people to engage with the issue of sustainability ... to feel like they are part of the solution in a very immediate, fun and visual way that doesn't make you do anything you wouldn't already be doing, " said Miller.

CNN: Green sidewalk makes electricity -- one footstep at a time

It may also be no coincidence that the testing of amateurs is well under way in Florida, home to countless anti-aging clinics that are a common source of testosterone and other performance-enhancing drugs.

WSJ: Cycling's Minor Leagues of Doping

For non-celebrities, the more common source of fake followers are spam bots which follow users in order to elicit a reciprocal follow, which then allows them to send spammy, direct messages to the Tweeter.

FORBES: Which Startup Bloggers Have The Most Legitimate Twitter Followers?