Read Edit View history 凹度 āodù concavity Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 凹度 · āodù · concavity 2026/03/04 凹度 āodù concavity concavity 透镜的凹度决定了它的焦距。 created sense Mar 4, 2026, 02:25 AM