部分问题在于，在亚马逊申请一键式专利后近二十年，人们对在线零售购物和购买体验提出了不少问题。

Part of the problem is that almost two decades after Amazon filed the one-click patent, the online retail shopping and buying experience is filled with frictions.

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文中提出的功率键合图建模方法能够较好地完成对人体循环系统建立仿真模型的工作，并对一个简化的循环系统生理模型进行了计算机仿真研究。

In this paper, the Power Band Graph (PBG) modeling method is used to realize modeling of the human circulation system and conduct a simulation study on a simplified physiological system model.

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从而提出了基于虚拟二叉键树的分布式索引模型及其构建算法。

Then a model based on virtual binary key tree is put forward and the construction algorithm is given.

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