isometric circle的用法和樣例：
例句
- The locus of points equidistant from a given point is a circle.
與一個定點等距的點的軌跡是一個圓。 - The outlining curve of an isometric polygon is one of the un-rounded curves, it is difficult to measure its parameters and calculate the errors.
摘要等距型面輪廓曲線為非圓曲線的一種，對其參數的測量和誤差的計算比較困難，目前尚沒有統一的評價標準。
