graduation error的用法和樣例：
例句
- The principle straightness error of cutting square in work-pieces can be controlled by choosing a suitable pitch diameter of the planetary gear in the machine tools.
選取適當的車頭行星輪的分度圓直徑，可以有效地控制車方原理的直線度誤差。 - The evolutional model and the calculation process are introduced in detail.The flatness error is discussed as an example.
文中以平面度誤差為例，詳細地介紹了進化模型的建立及計算方法。
