• 1. right angle spread: 直角展开
• 2. right-angle spread: 垂直排列

• 1.BlueMoon Arena is built on spread foundation, and its roof is an incomplete right four angle pyramid double layer reticulated shell.
  蓝月亮表演场基础采用天然地基上扩展基础，屋盖采用正放四角锥双层非完整球面钢网壳。
  dict.yoduao.com

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