核心的瓶颈首先在于精度问题。目前技术虽然在不断进步，但在打印精细结构或大尺寸零件时，依然难以达到高精度装配所需的公差要求及优秀的表面质量要求，这直接导致了打印件难以直接作为最终功能部件使用。
int pivotIdx = partition(arr, low, high); // 分区并获取pivot位置
，更多细节参见51吃瓜
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。关于这个话题，WPS下载最新地址提供了深入分析
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