permutation group

• 1. 排列群: permutation group
• 2. 竖向排列地下硐室群: Vertical arranged underground caverns

• 1.天文学家探索NGC346星云，识别出一个在黑暗中排列的恒星胚胎群，就是这幅图的右侧可见的交叉的星尘线。
  Exploring NGC 346, astronomers have identified a population of embryonic stars strung along the dark, intersecting dust lanes visible here on the right.
  dict.yoduao.com
• 2.教堂根据现有建筑的排列方向进行布局，这样，谨慎嵌入的教堂与现有建筑群的线条达成一致，简洁而明了、毫不突兀。
  We positioned it so that it would conform to the sequence of the existing row of buildings, by having it follow the same line as the others.
  dict.yoduao.com
• 3.根的顶端原始细胞为圆锥状排列的原始细胞群，未见典型的组织原分区。
  The apical initial cells of the root top were arranged in cone shape and no typical histogen zones were found.
  dict.yoduao.com

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