The obvious difficulty is that trying to illustrate animations and dynamic effects by definition is not easy on a static medium.

显见的难点是作者不容易在静态媒体上图解动画和动态效果。

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Aimed at solving detection and track difficulty of aortic arch dynamic image we proposed dynamic image detection method based on coordinate track.

针对解决主动脉弓运动图像检测和跟踪的难点，提出了基于坐标跟踪的动态图像检测方法。

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The degree of difficulty in algorithms is gradually enhanced in proper order from dynamic programming to continue fraction algorithm.

算法的实现难易程度由动态规划算法到多项式算法依次提高。

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"The dynamic of the show changed with the difficulty of what she was going through... that said, Joely's the best she's ever been, " he added.

BBC: NEWS | Entertainment | Richardson takes Nip/Tuck break

Adam Ozemik has two thoughtful pieces up ( here and here) on the economics of unions and the difficulty organized labor faces in a global, dynamic economy.

FORBES: The Economics of Unions

For most Chinese companies, the domestic market is already so big and dynamic, the additional revenues offered by investing in smaller markets in the Gulf fail to justify the difficulty of operating there, according to Ben Simpfendorfer, an economist and author of The New Silk Road: How a Rising Arab World is Turning Away from the West and Rediscovering China.

FORBES: Add Oil! Chinese Drill-Pipe Maker Ventures Into The Middle East