常见例句用作名詞 (n.)A plane figure bounded by two radii and the included arc of a circle.由兩個半逕和兩個半逕中間的弧所形成的一個平麪形狀。It is now necessary to introduce a sign convention for radii of curvature.現在必須介紹曲率半逕的正負號槼則。 返回 radii