以四分树为数据结构，建立了网格细分法生成自适应网格算法。
The generation algorithm of adaptive mesh which is based on the quad-tree data structure is presented.
线性四分树将物体区域表示为组成物体区域的四分块的位置码的集合。
Linear quadtrees represent image as a set of orientation code of each object region.
本文提出了一种基于线性四分树表示的二值图象四邻域寻找的快速算法。
This paper presents a 4-neighborhood finding algorithm for binary image represented by linear quadtrees.
圣诞树的价格一般为树木均价的四分之一，但在大多北美城市，人们过完圣诞后通常会将圣诞树做成腐叶土，或干脆丢弃。
Trees normally cost four times less on average, but are usually turned into mulch or sent to garbage dumps after the holidays in most North American cities.
七叶树队选定了一名年轻的新四分卫参加玫瑰杯足球赛。
The buckeyes fielded a young new quarterback for the rose bowl.
七叶树队选定了一名年轻的新四分卫参加玫瑰杯足球赛。
The buckeyes fielded a young new quarterback for the rose bowl.
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