Article InformationAuthor, 鄭佩珊
细观蜡梅，花瓣层叠，错位交叉，以花蕊为核心，紧紧簇拥在一起。花瓣厚实，直至凋谢都不会褪色；常于枯枝绽放，不借绿叶衬托，枯萎后也常留枝头。这种坚韧的品性，恰如宜昌这座城市，愈是危难困境，愈是凌霜傲雪，勇毅绽放。
。Line官方版本下载是该领域的重要参考
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Shortcuts: For common scenarios, we pre-calculate the travel time/distance (the "shortcut") between border points within the same cluster and also to border points of immediately adjacent clusters.