"author": item.get("author"),
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。
，详情可参考Line官方版本下载
输入：heights = [10,6,8,5,11,9]
One challenging part of this phase of development was the need to continue adding new features to the game while simultaneously converting the game's architecture for offline play.
Photograph: Simon Hill