Read Edit View history 凹线 āoxiàn groove Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 凹线/凹線 · āoxiàn · groove 2026/03/04 凹线 / 凹線 āoxiàn groove groove 他在零件上刻了一条精细的凹线。 created sense Mar 4, 2026, 02:25 AM