Also, he notes, the most difficult problems are always the most expensive to solve, which makes challenging projects less attractive if they’re judged by their “bang-for-the-buck” efficiency.
另外，他也指出，最大的困难就是按照“货真价实”的标准判断，最费钱的项目就变得不那么令人心动了。
Propose a method based on shape matching to solve the occlusion and error accumulation which are two difficult problems in the human body tracking.
提出了一种基于轮廓匹配来预测二维关节点的算法，有效地解决了遮挡和跟踪错误积累这一关键问题。
There are a lot of NP-hard optimization problems in the engineering application, which are difficult to solve by traditional mathematical techniques.
在实际工程应用中有很多优化问题是NP难问题，难以应用传统数学方法来解决。
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