A plane figure bounded by two radii and the included arc of a circle. 由两个半径和两个半径中间的弧所形成的一个平面形状。
This simplification does not place our analysis in jeopardy of being oversimplified, at least in terms of the plane shape of the dike complex. 这种简化不会使我们的分析处于过于简化的危险，至少采用岩脉组合的平面形状不会这样。
