Of course, due to the difficulty of obtaining complete knowledge over those common business entities, certain extensions are normally required for any specific realization of a business solution.

当然，由于通过这些普通业务实体难以获得全面的知识，所以任何特定的业务解决方案的实现还通常需要某些扩展。

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Courage is the ability to face danger, difficulty, uncertainty, or pain without being overcome by fear or being deflected from a chosen course of action.

勇气是面对危险，困境，不确定因素和痛苦而毫不畏惧，或是敢想敢干的气概。

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Process synchronization is an emphasis and difficulty in the teaching of operating system course.

在操作系统课程的教学中，进程同步是其中一个重点，也是难点。

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The difficulty of this course consists in the fact that it teaches what you already know.

这门课程的难度，就在于,传授的都是你们已有的知识。

耶鲁公开课 - 公正课程节选

Nevertheless, the inflation outlook remains highly uncertain, not least because of the difficulty of predicting the future course of commodity prices, and we will continue to monitor inflation and inflation expectations closely.

FORBES: Reducing Systemic Risk

The difficulty, of course, is that live shows can appear excruciatingly dull when transferred to television or video.

WSJ: Culture City: The Arts Festival You Can Watch on Your Couch

The difficulty, of course, is industry-wide acceptance and adoption.

FORBES: The 128-Byte Data Field That Could Save Lives and Billions of Dollars