datum transformation的用法和樣例：
例句
- The unitary iris image is carried out through the transformation from Cartesian coordinates to polar coordinates.
然後採用極坐標轉換對虹膜圖像進行歸一化。 - This paper presents calculation method and coordinate transformation relation in detail, which can be used in similar project design directly and reduce design work greatly.
對計算方法和坐標轉換關係作了詳細介紹，可直接運用於類似工程設計，從而使設計工作量大為減少。
