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principal triangulation
 principal triangulation
hydroel.st. 一等三角测量
| point
 point
gen. 一项; 一点; 指出; 时刻; 要点
environ. 重点
met. 末端; 论点
sport.

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principal triangulation
hydroel.st. 一等三角测量
principal triangulation: 1 phrase in 1 subject
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