The disadvantages are that you have to pay for them, they have a steep learning curve, and they don't allow you access to their source code in case you need to modify a feature.

而缺点是您需要为它们付费，有一段陡峭的学习曲线，而且当您需要修改功能时不允许您访问源代码。

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If you already use of any of the above open source projects, your learning curve for Geronimo will be significantly shorter.

如果您使用过以上的开放源码项目之一，那么学习Geronimo的过程就会大大缩短。

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The wheel web, by virtue of its geometry and material characteristics, is a good emitter of high-frequency sound, and is believed to be the primary source of curve squeal noise.

尺寸和材料的特性导致了轮辋是一个良好的高频声源，轮辋也被认为是曲线尖啸噪声的主要来源。

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Or is Jorge Paulo Lemann and his partners ahead of the curve, and Brazil will become a larger source of foreign investors in the near future?

FORBES: The Hangover: New Book Shows How Anheuser-Busch Lost Its Buzz and Fell Into Foreign Hands

But now a series of deals is finally allowing Microsoft to argue that it's ahead of the curve--with the entertaining upside of making some of the open-source community's truest believers even angrier.

FORBES: Microsoft's Protection Racket?