principal point的用法和樣例：
例句
- The principal points of a thin lens coincide at the center of the lens.
薄透鏡的兩個主點與透鏡中心相重合。
principal point的相關資料：
臨近單詞
principal boy
principal
principal axis of stress tensor
principal part of consciousness
principal mechanical components
principal axis of strain tensor
principal components estimation
principal orientation direction
principal -agent relationship
principal part of the attribute
principal square root of matrix
Principal Naval Liaison Officer
